Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hi, Bahaa Gamal
Good day!
Thank you for posting to Microsoft Community. We are happy to help you!
According to your description, the issue of your concern that there's an unexpected error after you adding the user into MDM.
For this given issue which is relates to the Microsoft Intune, and which is beyond my knowledge and experience. We're afraid that we could not give you an appropriate suggestion here.
Nevertheless, we would like to refer you to Microsoft Intune specializing team who dedicating into MDM with rich experience and more resources -Microsoft Intune
We believe they would conduct in-depth of this issue and provide you a more professional suggestion.
Thanks in advance for your understanding! Your patience and cooperation will be highly appreciated. Hope you all the best!
Sincerely,
Microsoft Community Moderator