SCOM MP for M365 - V3 (now GA)

I just upgraded to SCOM 2022, which has now broken this MP for me.  The watchers all alert with various Events stating the following:

ERROR. Message: System.Exception: Unable to acquire authorization token. Possible connectivity issue.

or

Waiting for access token to be returned without a timeout.

The M365 Connection State monitor also fails with:
Error: Exception (1): Unable to acquire authorization token. Possible connectivity issue. Exception: Request to the endpoint timed out. Exception (2): Request to the endpoint timed out. Exception (3): A task was canceled.

I tried all of the following but none of this hasn't made any difference:

• re-entered Client Secret
• rebooted Management Server
• rebooted watchers
• upgraded clients to SCOM 2022
• downgraded clients back to SCOM 2019 UR3
• As per new v3 documentation (new details) modified Redirect URI to https://localhost 
• As per new v3 documentation (new details) modified Allow public client flows 
• Created a new Client Secret and changed the Subscription to use it (this seemed to be limited to 2 years now versus the existing which is not limited in end date)

I'm out of ideas now, short of deleting the entire App registration and creating it again, which I would rather not if possible!

Please help!

UPDATE:  the respective Management Server and agent config files had been overwritten - updated them and restarted services and all working now!