Hello Fredrik Bålstedt,
Thanks for your question.
Since you have enabled single sign on, I would recommend the following steps:
- Confirm under app registrations the needed API permissions and granted https://learn.microsoft.com/en-us/entra/identity-platform/quickstart-register-app
- Grant Admin Consent: https://learn.microsoft.com/en-us/entra/identity/enterprise-apps/grant-admin-consent?pivots=portal
- Lastly, grant users/groups permission to the app by assigning them to it.: https://learn.microsoft.com/en-us/entra/identity/enterprise-apps/assign-user-or-group-access-portal?pivots=portal
Please let me know if you have further questions
You can mark it 'Accept Answer' if this helped.