Sign in With Apple Group existing app Id issue

Hello,

I have multiple apps that i would like to login with apple login connected to same backend.

I enabled sign in with apple on all and told them to "group with primary app id" which is one of them.

I went and created 1 service id and key and used that on the backend to login the user.

I can login fine on the primary app id but not on the grouped ones. Am I missing anything setup wise?

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Did you ever figure out a solution to this? encountering the same issue.