I want to follow up regarding the above question. I have not heard back from you since my last comment.
Can i use local AD group synced to Azure AD for access to DB in Azure flex Postgres:
Yes, as long as the sync'd groups created as security groups you can be used
Additional info:
To sync users from the local AD to Azure you will need to use Microsoft Entra Connect and set up the synchronization and authentication. Directory synchronization with Microsoft Entra ID - Microsoft Entra | Microsoft Learn
If you are looking to integrate on prem AD domain to Azure Entra ID please see tis link to get more details. https://learn.microsoft.com/en-us/azure/architecture/reference-architectures/identity/azure-adhttps://learn.microsoft.com/en-us/entra/identity/hybrid/whatis-hybrid-identity
Please let me know if that helps.
Regards,
Oury