@Shreen Hassan Thanks for posting in our Q&A. Did you mean that the Azure AD account couldn't login to the enrolled windows devices? If there is anything misunderstanding, feel free to let us know.
For Azure AD user login issues, it is more related to Azure AD. I just give you some information that I know. If the enrolled device's join type is "Azure AD registered", we couldn't use Azure AD account to login and we could use local user to login.
If we need more information about Azure AD login issue, it is suggested to contact Azure AD to get more accurate help. The following link describes how to open a case, we can refer to it:
https://learn.microsoft.com/en-us/azure/active-directory/fundamentals/active-directory-troubleshooting-support-howto
Hope it will help.
If the response is helpful, please click "Accept Answer" and upvote it.
Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.