The Google Ad Manager connector fails with the error:
Connector: Google Ad Manager
To resolve this issue, check whether your network code has changed or remains the same by following the steps below:
Go to your Ad Manager network.
Find your network code in the URL when you are logged into your network. For example, in the URL,
https://www.google.com/dfp/2032576#delivery, the network code is,
Check the code in your connector setup form.
Please also make sure that the connecting user has access to the Google Ad Manager (network).
Lastly, it's possible that access to the API has been revoked for the connecting user. If so, attempt to re-enable API access by following Google's guide here.