diff --git a/roles/kube_prometheus_stack/vars/main.yml b/roles/kube_prometheus_stack/vars/main.yml
index b32069adf..4a3d030b3 100644
--- a/roles/kube_prometheus_stack/vars/main.yml
+++ b/roles/kube_prometheus_stack/vars/main.yml
@@ -153,6 +153,7 @@ _kube_prometheus_stack_helm_values:
       server:
         root_url: https://{{ kube_prometheus_stack_grafana_host }}
       auth:
+        oauth_allow_insecure_email_lookup: true
         oauth_skip_org_role_update_sync: false
         disable_login_form: true
         signout_redirect_url: "{{ kube_prometheus_stack_keycloak_server_url }}/realms/{{ kube_prometheus_stack_keycloak_realm }}/protocol/openid-connect/logout?post_logout_redirect_uri=https://{{ kube_prometheus_stack_grafana_host }}/login"