I have the same issue... The documentation for setting this up is really lacking...
alabiaga
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Same here. I had issues with the verification of my domain for email relaying the other day which was resolved eventually...clicking verify didn't work all day until it did by the end of the day.
I filed a similar issue in Feedback Assistant. I am using python and have tried pyjwt and jwcrypto to generate the client secret (both supporting ES256) but am still getting an invalid_client error. Can I get a more detail exception as what I am doing incorrectly?
Just wanted to add a note here that I was able to resolve my issue. The issue was not with the client secret but with the TTL for my secret which expired way too soon and the redirect URI set for getting an auth token not being whitelisted in Apple developer services dashboard for apple sign in.