diff --git a/api/src/certification/enrolment/domain/usecases/add-candidate-to-session.js b/api/src/certification/enrolment/domain/usecases/add-candidate-to-session.js
index 5bdbec3a680..ecabb5e092f 100644
--- a/api/src/certification/enrolment/domain/usecases/add-candidate-to-session.js
+++ b/api/src/certification/enrolment/domain/usecases/add-candidate-to-session.js
@@ -101,7 +101,7 @@ export async function addCandidateToSession({
     } catch {
       throw new CertificationCandidatesError({
         code: CERTIFICATION_CANDIDATES_ERRORS.CANDIDATE_RESULT_RECIPIENT_EMAIL_NOT_VALID.code,
-        meta: { email: candidate.resultRecipientEmail },
+        meta: { value: candidate.resultRecipientEmail },
       });
     }
   }
@@ -111,7 +111,7 @@ export async function addCandidateToSession({
     } catch {
       throw new CertificationCandidatesError({
         code: CERTIFICATION_CANDIDATES_ERRORS.CANDIDATE_EMAIL_NOT_VALID.code,
-        meta: { email: candidate.email },
+        meta: { value: candidate.email },
       });
     }
   }
diff --git a/api/src/shared/application/error-manager.js b/api/src/shared/application/error-manager.js
index 2b6539a7312..64ce2838253 100644
--- a/api/src/shared/application/error-manager.js
+++ b/api/src/shared/application/error-manager.js
@@ -469,7 +469,7 @@ function _mapToHttpError(error) {
   }
 
   if (error instanceof DomainErrors.CertificationCandidateOnFinalizedSessionError) {
-    return new HttpErrors.ForbiddenError(error.message);
+    return new HttpErrors.ForbiddenError(error.message, error.code);
   }
 
   if (error instanceof DomainErrors.OrganizationLearnerCannotBeDissociatedError) {
diff --git a/api/src/shared/domain/errors.js b/api/src/shared/domain/errors.js
index 40e29c6384b..0aa8f1c34f0 100644
--- a/api/src/shared/domain/errors.js
+++ b/api/src/shared/domain/errors.js
@@ -96,6 +96,7 @@ class CertificationEndedByFinalizationError extends DomainError {
 class CertificationCandidateOnFinalizedSessionError extends DomainError {
   constructor(message = "Cette session a déjà été finalisée, l'ajout de candidat n'est pas autorisé") {
     super(message);
+    this.code = 'CANDIDATE_NOT_ALLOWED_FOR_FINALIZED_SESSION';
   }
 }
 
diff --git a/api/tests/shared/unit/application/error-manager_test.js b/api/tests/shared/unit/application/error-manager_test.js
index 78b242e1c1c..0e927843cc2 100644
--- a/api/tests/shared/unit/application/error-manager_test.js
+++ b/api/tests/shared/unit/application/error-manager_test.js
@@ -661,7 +661,7 @@ describe('Shared | Unit | Application | ErrorManager', function () {
       await handle(params.request, params.h, params.error);
 
       // then
-      expect(HttpErrors.ForbiddenError).to.have.been.calledWithExactly(error.message);
+      expect(HttpErrors.ForbiddenError).to.have.been.calledWithExactly(error.message, error.code);
     });
 
     it('should instantiate ConflictError when CertificationEndedByFinalizationError', async function () {
diff --git a/certif/app/components/sessions/session-details/enrolled-candidates/index.gjs b/certif/app/components/sessions/session-details/enrolled-candidates/index.gjs
index 043deaa2f5b..e2defdd1478 100644
--- a/certif/app/components/sessions/session-details/enrolled-candidates/index.gjs
+++ b/certif/app/components/sessions/session-details/enrolled-candidates/index.gjs
@@ -234,6 +234,8 @@ export default class EnrolledCandidates extends Component {
         return this._handleEntityValidationError(errorResponse);
       case '400':
         return this._handleMissingQueryParamError(errorResponse);
+      case '403':
+        return this._handleApiError(errorResponse);
       default:
         return this.intl.t(`${TRANSLATE_PREFIX}.add-modal.notifications.error-add-unknown`);
     }
@@ -248,6 +250,15 @@ export default class EnrolledCandidates extends Component {
     }
   }
 
+  _handleApiError(errorResponse) {
+    const error = errorResponse?.errors?.[0];
+    if (error?.code) {
+      return this.intl.t(`common.api-error-messages.${error.code}`, {
+        ...error?.meta,
+      });
+    }
+  }
+
   _handleMissingQueryParamError(errorResponse) {
     const error = errorResponse?.errors?.[0];
     if (error?.detail === 'CANDIDATE_BIRTHDATE_FORMAT_NOT_VALID') {
diff --git a/certif/tests/integration/components/sessions/session-details/enrolled-candidates/index-test.gjs b/certif/tests/integration/components/sessions/session-details/enrolled-candidates/index-test.gjs
index 631f8906033..cefe0405a67 100644
--- a/certif/tests/integration/components/sessions/session-details/enrolled-candidates/index-test.gjs
+++ b/certif/tests/integration/components/sessions/session-details/enrolled-candidates/index-test.gjs
@@ -48,10 +48,7 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
 
   test('it should have an accessible table description', async function (assert) {
     //given
-    const candidate = _buildCertificationCandidate({
-      birthdate: new Date('2019-04-28'),
-      subscriptions: [],
-    });
+    const candidate = _buildCertificationCandidate({ subscriptions: [] });
 
     const certificationCandidates = [store.createRecord('certification-candidate', candidate)];
     const countries = [store.createRecord('country', { name: 'CANADA', code: 99401 })];
@@ -89,7 +86,6 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
       complementaryCertificationId,
     });
     const candidate = _buildCertificationCandidate({
-      birthdate: new Date('2019-04-28'),
       accessibilityAdjustmentNeeded: true,
       subscriptions: [coreSubscription, complementarySubscription],
     });
@@ -131,9 +127,7 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
 
   test('it should display details button', async function (assert) {
     // given
-    const candidate = _buildCertificationCandidate({
-      subscriptions: [],
-    });
+    const candidate = _buildCertificationCandidate({ subscriptions: [] });
     const certificationCandidates = [store.createRecord('certification-candidate', candidate)];
     const countries = [store.createRecord('country', { name: 'CANADA', code: 99401 })];
 
@@ -158,9 +152,7 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
 
   test('it should display details modal', async function (assert) {
     // given
-    const candidate = _buildCertificationCandidate({
-      subscriptions: [],
-    });
+    const candidate = _buildCertificationCandidate({ subscriptions: [] });
     const certificationCandidates = [store.createRecord('certification-candidate', candidate)];
     const countries = [store.createRecord('country', { name: 'CANADA', code: 99401 })];
 
@@ -190,19 +182,9 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
     test('it should be possible to delete the candidate', async function (assert) {
       // given
       const certificationCandidates = [
-        _buildCertificationCandidate({
-          id: 1,
-          firstName: 'Riri',
-          lastName: 'Duck',
-          subscriptions: [],
-        }),
-        _buildCertificationCandidate({ id: 2, firstName: 'Fifi', lastName: 'Duck', subscriptions: [] }),
-        _buildCertificationCandidate({
-          id: 3,
-          firstName: 'Loulou',
-          lastName: 'Duck',
-          subscriptions: [],
-        }),
+        _buildCertificationCandidate({ id: '1' }),
+        _buildCertificationCandidate({ id: '2', firstName: 'Lara', lastName: 'Pafromage' }),
+        _buildCertificationCandidate({ id: '3', firstName: 'Jean', lastName: 'Registre' }),
       ].map((candidateData) => store.createRecord('certification-candidate', candidateData));
       const countries = [store.createRecord('country', { name: 'CANADA', code: 99401 })];
 
@@ -221,7 +203,7 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
         </template>,
       );
 
-      await click(screen.getByRole('button', { name: 'Supprimer le candidat Riri Duck' }));
+      await click(screen.getByRole('button', { name: 'Supprimer le candidat Eddy Taurial' }));
 
       // then
       sinon.assert.calledOnce(certificationCandidates[0].destroyRecord);
@@ -235,21 +217,9 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
     test('it display candidates with delete button disabled', async function (assert) {
       // given
       const certificationCandidates = [
-        _buildCertificationCandidate({
-          id: 1,
-          firstName: 'Riri',
-          lastName: 'Duck',
-          isLinked: false,
-          subscriptions: [],
-        }),
-        _buildCertificationCandidate({ id: 2, firstName: 'Fifi', lastName: 'Duck', isLinked: true, subscriptions: [] }),
-        _buildCertificationCandidate({
-          id: 3,
-          firstName: 'Loulou',
-          lastName: 'Duck',
-          isLinked: false,
-          subscriptions: [],
-        }),
+        _buildCertificationCandidate({ id: '1' }),
+        _buildCertificationCandidate({ id: '2', firstName: 'Lara', lastName: 'Pafromage', isLinked: true }),
+        _buildCertificationCandidate({ id: '3', firstName: 'Jean', lastName: 'Registre' }),
       ].map((candidateData) => store.createRecord('certification-candidate', candidateData));
       const countries = [store.createRecord('country', { name: 'CANADA', code: 99401 })];
 
@@ -266,13 +236,13 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
 
       // then
       assert
-        .dom(screen.getByRole('button', { name: 'Supprimer le candidat Riri Duck' }))
+        .dom(screen.getByRole('button', { name: 'Supprimer le candidat Eddy Taurial' }))
         .hasClass(DELETE_BUTTON_SELECTOR);
       assert
-        .dom(screen.getByRole('button', { name: 'Supprimer le candidat Fifi Duck' }))
+        .dom(screen.getByRole('button', { name: 'Supprimer le candidat Lara Pafromage' }))
         .hasClass(DELETE_BUTTON_DISABLED_SELECTOR);
       assert
-        .dom(screen.getByRole('button', { name: 'Supprimer le candidat Loulou Duck' }))
+        .dom(screen.getByRole('button', { name: 'Supprimer le candidat Jean Registre' }))
         .hasClass(DELETE_BUTTON_SELECTOR);
     });
   });
@@ -308,27 +278,9 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
       test('it display candidates with an edit button', async function (assert) {
         // given
         const certificationCandidates = [
-          _buildCertificationCandidate({
-            id: 1,
-            firstName: 'Riri',
-            lastName: 'Duck',
-            isLinked: false,
-            subscriptions: [],
-          }),
-          _buildCertificationCandidate({
-            id: 2,
-            firstName: 'Fifi',
-            lastName: 'Duck',
-            isLinked: true,
-            subscriptions: [],
-          }),
-          _buildCertificationCandidate({
-            id: 3,
-            firstName: 'Loulou',
-            lastName: 'Duck',
-            isLinked: false,
-            subscriptions: [],
-          }),
+          _buildCertificationCandidate({ id: '1' }),
+          _buildCertificationCandidate({ id: '2', firstName: 'Lara', lastName: 'Pafromage', isLinked: true }),
+          _buildCertificationCandidate({ id: '3', firstName: 'Jean', lastName: 'Registre' }),
         ].map((candidateData) => store.createRecord('certification-candidate', candidateData));
         const countries = [store.createRecord('country', { name: 'CANADA', code: 99401 })];
 
@@ -346,12 +298,14 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
         // then
 
         // then
-        assert.dom(screen.getByRole('button', { name: 'Editer le candidat Riri Duck' })).hasClass(EDIT_BUTTON_SELECTOR);
         assert
-          .dom(screen.getByRole('button', { name: 'Editer le candidat Fifi Duck' }))
+          .dom(screen.getByRole('button', { name: 'Editer le candidat Eddy Taurial' }))
+          .hasClass(EDIT_BUTTON_SELECTOR);
+        assert
+          .dom(screen.getByRole('button', { name: 'Editer le candidat Lara Pafromage' }))
           .hasClass(EDIT_BUTTON_DISABLED_SELECTOR);
         assert
-          .dom(screen.getByRole('button', { name: 'Editer le candidat Loulou Duck' }))
+          .dom(screen.getByRole('button', { name: 'Editer le candidat Jean Registre' }))
           .hasClass(EDIT_BUTTON_SELECTOR);
         assert.strictEqual(
           screen.getAllByText("Ce candidat a déjà rejoint la session. Vous ne pouvez pas l'éditer.").length,
@@ -363,7 +317,6 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
         test('should display candidate needs accessibility adjusted certification', async function (assert) {
           // given
           const candidate = _buildCertificationCandidate({
-            birthdate: new Date('2019-04-28'),
             accessibilityAdjustmentNeeded: true,
           });
 
@@ -391,7 +344,6 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
         test('should display candidate doesnt need accessibility adjusted certification', async function (assert) {
           // given
           const candidate = _buildCertificationCandidate({
-            birthdate: new Date('2019-04-28'),
             accessibilityAdjustmentNeeded: false,
           });
 
@@ -420,7 +372,6 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
       test('should not display accessibility adjusted certification needed information', async function (assert) {
         // given
         const candidate = _buildCertificationCandidate({
-          birthdate: new Date('2019-04-28'),
           accessibilityAdjustmentNeeded: true,
         });
 
@@ -450,20 +401,8 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
       test('it does not display candidates with an edit button', async function (assert) {
         // given
         const certificationCandidates = [
-          _buildCertificationCandidate({
-            id: 1,
-            firstName: 'Riri',
-            lastName: 'Duck',
-            isLinked: false,
-            subscriptions: [],
-          }),
-          _buildCertificationCandidate({
-            id: 2,
-            firstName: 'Fifi',
-            lastName: 'Duck',
-            isLinked: true,
-            subscriptions: [],
-          }),
+          _buildCertificationCandidate({ id: '1' }),
+          _buildCertificationCandidate({ id: '2', firstName: 'Lara', lastName: 'Pafromage', isLinked: true }),
         ].map((candidateData) => store.createRecord('certification-candidate', candidateData));
         const countries = [store.createRecord('country', { name: 'CANADA', code: 99401 })];
 
@@ -479,8 +418,8 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
         );
 
         // then
-        assert.dom(screen.queryByRole('button', { name: 'Editer le candidat Riri Duck' })).doesNotExist();
-        assert.dom(screen.queryByRole('button', { name: 'Editer le candidat Fifi Duck' })).doesNotExist();
+        assert.dom(screen.queryByRole('button', { name: 'Editer le candidat Eddy Taurial' })).doesNotExist();
+        assert.dom(screen.queryByRole('button', { name: 'Editer le candidat Lara Pafromage' })).doesNotExist();
       });
     });
   });
@@ -498,7 +437,6 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
         complementaryCertificationId: cleaCertificationId,
       });
       const candidate = _buildCertificationCandidate({
-        birthdate: new Date('2019-04-28'),
         subscriptions: [coreSubscription, complementarySubscription],
       });
       const complementaryCertifications = [
@@ -728,18 +666,18 @@ module('Integration | Component | Sessions | SessionDetails | EnrolledCandidates
 
 function _buildCertificationCandidate({
   id = '12345',
-  firstName = 'Bob',
-  lastName = 'Leponge',
-  birthdate = new Date(),
-  birthCity = 'Marseille',
-  birthProvinceCode = '',
-  birthCountry = '',
-  email = 'bob.leponge@la.mer',
-  resultRecipientEmail = 'recipient@college.fr',
+  firstName = 'Eddy',
+  lastName = 'Taurial',
+  birthdate = '1990-03-22',
+  birthCity = 'Sainte-Anne',
+  birthProvinceCode = '01',
+  birthCountry = 'France',
+  email = 'eddy.taurial@example.com',
+  resultRecipientEmail = 'pat.atrak@example.com',
   externalId = 'an external id',
   extraTimePercentage = 0.3,
   isLinked = false,
-  billingMode = null,
+  billingMode = 'FREE',
   prepaymentCode = null,
   accessibilityAdjustmentNeeded = false,
   subscriptions = [],
diff --git a/certif/translations/en.json b/certif/translations/en.json
index 39e5cbdfe64..9d479fd043c 100644
--- a/certif/translations/en.json
+++ b/certif/translations/en.json
@@ -21,6 +21,7 @@
       "validate": "Validate"
     },
     "api-error-messages": {
+      "CANDIDATE_NOT_ALLOWED_FOR_FINALIZED_SESSION": "This session has already been finalised and no new candidates may be added.",
       "CANDIDATE_NOT_FOUND": "An error has occurred, the candidate {firstName} {lastName} hasn't been found.",
       "INVALID_DOCUMENT": "This version of the document is unknown.<br />Please download and import the candidate list template again",
       "SESSION_ALREADY_FINALIZED": "Cannot finalize session more than once.",
@@ -1029,4 +1030,4 @@
       "page-title": "Terms and conditions"
     }
   }
-}
\ No newline at end of file
+}
diff --git a/certif/translations/fr.json b/certif/translations/fr.json
index ebece47902c..3db223d2430 100644
--- a/certif/translations/fr.json
+++ b/certif/translations/fr.json
@@ -21,6 +21,7 @@
       "validate": "Valider"
     },
     "api-error-messages": {
+      "CANDIDATE_NOT_ALLOWED_FOR_FINALIZED_SESSION": "Cette session a déjà été finalisée, l'ajout de candidat n'est pas autorisé.",
       "CANDIDATE_NOT_FOUND": "Une erreur est survenue, le candidat {firstName} {lastName} n'a pas été trouvé.",
       "INVALID_DOCUMENT": "La version du document est inconnue.<br />Veuillez télécharger à nouveau le modèle de liste des candidats et l'importer à nouveau.",
       "SESSION_ALREADY_FINALIZED": "La session a déjà été finalisée.",
@@ -1029,4 +1030,4 @@
       "page-title": "Conditions générales"
     }
   }
-}
\ No newline at end of file
+}