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Hello,I am unable to get sign in with apple working. Currently, i get this response when attempting to hit https://appleid.apple.com/auth/token: Invalid redirect_uri.The redirect_uri has been properly setup as documented.Can you please assist?I created a radar ticket for this: FB7239836Thank you

Sign In With Apple has a "group apps" category: https://help.apple.com/developer-account/?lang=en#/dev04f3e1cfcHowever, thats the only information I could find for "sign in with apple" and "group apps".What is the significants of "group apps" with "sign in with apple"? What does it do? How does one use it?Does it support the following use-case?: I have a primary app and a child app. If I "sign in with apple" with the primary app, and then i want to use the secondary app, do i have to sign in again? Or am I already signed in because I have signed in with the primary app? Or can I architect it in such a way that allows me to sign in to one of the grouped apps, and then stay signed in when using another grouped app?