@johnsmithnew Did you find a path forward here? Were you able to see the Declared Age Range API respect your Sandbox age assurance settings in TestFlight?

+1 to this. Would like to see a response here.

Any update here? I'm having the same issue on 26.2 beta 3 while signed in to Sandbox and had Age Assurance set to child 13-15. I keep getting the notAvailable error.