@NBL Apologies for the delay in response and all the inconvenience caused because of the issue.
The issue might be with your AD/AAD setup. So you might would need to involve Support to investigate.
If you have a support plan, requesting you to file a support ticket, else please do let us know, we will try and help you get a one-time free technical support.
Hope it helps!!!
Please "Accept as Answer" if it helped so it can help others in community looking for help on similar topics.