Hi, Are you guys able to resolve this? It seems like I'm facing this issue as well when I'm trying to integrate Sign In With Apple with Amazon Cognito too. Do share your solution if you happened to resolve it. Thanks!

I'm facing the same issue as well. Also I am unable to remove the app from the listing that uses Sign In With Apple in Setting > iCloud > Sign In & Security > Sign In With Apple. Just curious if you are able to remove your account or not?

It is happening to me as well. It seems like Gmail does not like email coming from privaterelay.appleid.com. I am wondering is there any ways to avoid that.

@tmukun I'm facing the same issue as well. I contacted Apple Support but they're still unable to provide a solution at the moment. By any chance you're facing this issue as well? https://developer.apple.com/forums/thread/758647