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Error: Exchange: An unknown error has occurred. Refer to correlation ID:
Error: Exchange: An unknown error has occurred. Refer to correlation ID: Exchange license if off, only pro plus license is assigned, user is synced from Local AD. any known issue or fix? ...
Well you have your answer then. Removing the license of any user that's on hold is not supported, moreover it's a violation of the terms of use. Either remove the hold before removing the license, or delete the user while he's on hold, making it effectively an inactive mailbox.
Get the actual error message from PowerShell, either via the Exchange cmdlets or via MSOL:
Get-MsolUser -HasErrorsOnly | fl DisplayName,UserPrincipalName,@{Name="Error";Expression={($_.errors[0].ErrorDetail.objecterrors.errorrecord.ErrorDescription)}}
Thanks for the Note. But now MSOL were depreceated now how we can check it ?