Unable to login\reconnect using Azure AD connect

Nishanth N 1 Reputation point
2020-04-04T03:28:22.803+00:00

After the error on-premise server, the AD-connect program along with the connected programs had been removed. Prior to the error all the systems where working fine.
(this Single AD Forest using pass-through authentication) with MFA enabled with seamless sign on enabled

After the reinstall of the same verion of AD connect.
The error generate was "Unable to validate credentials due to an unexpected error, Restart Azure AD connect with/interactiveAuth Option to further diagnose the issue"
Also connect using the global admin details on the PC's connected to local domain.
Error from the landing page is "Sorry,that didn't work, Please go back to office.com and try again. thanks"

The connected users are still operational, the exchange server on cloud still work

Azure Active Directory
Azure Active Directory
An Azure enterprise identity service that provides single sign-on and multi-factor authentication.
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  1. Konrad 'Sagus' Sagala 81 Reputation points Microsoft MVP
    2020-04-04T09:07:35.223+00:00

    First of all - for PTA you need PTA agent installed, probably it was installed. Second - are you sure, that after fresh installation of AAD Connect you set the same settings? Did synchronization of accounts between on-premises and Azure AD working fine? It should be visible information about synchronization errors in Office 365 admin portal home page or Azure Active AD - Connect Health blade. Of course you need use cloud account to logon if PTA is not working properly.
    6988-aadsync-error.png

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