Entra Connect 365 connector has an increasing queue of exports with 'unexpected-error'

Question

Hi

Our Entra Connect sync has been running fine, I added an additional batch of users and modified details of some temp accounts to actual usernames and correct emails, and all these changes are now stuck in the export connector queue with "unexpected-error". Any further changes have just added to the queue, now 70+ items long. I have tried a full sync of the 365 connector, an initial sync in powershell, and have upgraded to the latest version of Entra Connect (I gather the last version had issues).

Event viewer shows:

Unexpected error while exporting the batch. BAIL: MMS(2108): export.cpp(2239): 0x8023030d (There is no primary object class on this image.)

BAIL: MMS(2108): export.cpp(1473): 0x8023030d (There is no primary object class on this image.)

BAIL: MMS(2108): export.cpp(523): 0x8023030d (There is no primary object class on this image.)

BAIL: MMS(2108): ..\cntrler.cpp(9699): 0x80230808 (The management agent run was terminated as there were unspecified management agent errors.)

BAIL: MMS(2108): ..\cntrler.cpp(8636): 0x80230808 (The management agent run was terminated as there were unspecified management agent errors.)

Azure AD Sync 2.6.1.0

I have checked in on-prem AD for any objects that are missing 'user' from their object class but those all look good.

[Moved from Microsoft 365 and Office | Other]