Connected Accounts, sending a reply or sends as the connected account the email stopped working

FYI .. i just hung up on O365 support session ... they have replicated in their lab ... and

Together on remote session .. deleted and re-added both an office 365 shared mailbox account and google account (non google domain hosted by google but uses same settings)  .. same result on both  .. it adds ..ie accepts credentials and downloads email but will not send due to failed verification email ..

we used powershell to view permissions on the connected accounts and attempt to force the send of the verification email  .. that failed for reasons that baffled the support engineer.

Captured transcipts of all powershell activity and recorded the failed email timestamps

He is going to engage developers to see why the powershell failed.

My feeling is if can get the powershell to allow the verification email to go out then will be back in business