diff --git a/bff/src/Altinn.Authentication.UI/Altinn.Authentication.UI.Tests/Utils/SetupUtils.cs b/bff/src/Altinn.Authentication.UI/Altinn.Authentication.UI.Tests/Utils/SetupUtils.cs
index d683f20e..68bfc56c 100644
--- a/bff/src/Altinn.Authentication.UI/Altinn.Authentication.UI.Tests/Utils/SetupUtils.cs
+++ b/bff/src/Altinn.Authentication.UI/Altinn.Authentication.UI.Tests/Utils/SetupUtils.cs
@@ -28,6 +28,7 @@ public static HttpClient GetTestClient<T>(CustomWebApplicationFactory<T> custome
             builder.ConfigureTestServices(services =>
             {
                 services.AddTransient<IAuthenticationClient, AuthenticationClientMock>();
+                services.AddTransient<IRegisterClient, RegisterClientMock>();
                 services.AddTransient<ISystemRegisterClient, SystemRegisterClientMock>();
                 services.AddTransient<ISystemUserClient, SystemUserClientMock>();
                 services.AddTransient<IAccessManagementClient, PartyClientMock>();