Since my question exceeds 700 words, please check it in the attachment. Thank you!
Hi @lijiaxu,
Sign in with Apple does not support localhost or requests with custom ports. Please expose your server to a publicly accessible IP address and try again. Please see the documentation below for more information:
Configuring your environment for Sign in with Apple https://developer.apple.com/documentation/sign_in_with_apple/configuring_your_environment_for_sign_in_with_apple
Cheers,
Paris X Pinkney | WWDR | DTS Engineer