
Hi Team,
we are using DI to integrate CE and Fin ops.
DI projects were having the issue.
The sync failed with error "Connection validation failed. Connection 'xyz' is not valid.
[Bad Request], The remote server returned an error: (400) Bad Request."
Issue was mitigated by updating the expired connection in DI and cause was: The Power Apps Connection to CRM had a status of not connected. Clicking the "Fix Connection" link solved the issue."
Now we are aware that the connection will expire if the validity of the refresh token expired.
More details about the token lifetime, please check the following document:
In our current scenario (Using DI to integrate CE and fin ops):
If you haven’t already, you should post this question in the D365 Finance forum https://community.dynamics.com/365/financeandoperations/f/dynamics-365-for-finance-and-operations-forum