Thank-you for replying back to your own question with how you solved it! Turns out that was my original issue also. I then ran into the `invalid_grant` issue again a bit later and found that if you don't provide the original `redirect_uri` it will also raise this error. So if you are validating an auth code for anything but native iOS, you need to return the `redirect_uri` that you sent to Apple.
jeremy_khan
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We're seeing the same issue here at Khan Academy. Started around 5:40am PDT. The TokenResponse has all fields except the id_token. As a result, Sign in with Apple is unusable for us right now.
Seems to have resolved here too.