Hello @coltran3
Thank you for your question regarding using Sign in with Apple authorization with the Apple Music API.
Sign in with Apple allows users to use their existing Apple ID to securely create and sign into an account in your app. The authorization process for the Apple Music API allows users to authorize your app to make requests, via the Music User Token, to the Apple Music API using their existing Apple Music account.
There is no way to use the Sign in With Apple authorization code in place of the Music User Token. The user would need to independently authorize your app for the use of the Apple Music API, even if they used Sign in With Apple to create their account with you.
