Hello @Abdelaziz Taleb Ahmad Alswiti
The team has identified the issue with AAD where only customers who are using MSA accounts are unable to login to Custom Vision portal. Currently, there is a workaround for this issue.
Create a new user in the tenant and grant this user as owner of the subscription.
Use this user to login to Azure portal for the first time.
Use this user to login to Custom Vision portal.
By doing so, the new created user is an AAD user and is not an MSA account. We are actively working to resolve the AAD issue to ensure the users who already had access can use the portal again.
Apologies for the inconvenience. I will update here when the issue has been fixed.
Regards,
Yutong