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Seems like it might be related to: <https://github.com/Azure/login/issues/205#issuecomment-1075791167>

Reading further...

Absolutely crazy...

I think it was some kind of encoding issue. The json from the `az ad sp...` command was sent to me via Outlook secure email.

Visually the test and uat json look identical, save the values for client ID and client secret.

So I pasted the uat client ID and secret into the test json and updated the github secret. That worked.

Talk about inscrutable.

Sorry to bother you all.

Glad you figured it out! Encoding can be a nightmare.