Apple SSO response "invalid_client"

Apple SSO response "invalid_client"

• Process

1. Access apple auth token url
2. Showed apple login view
3. Login as genuine apple user(email, password)
4. Authenticate apple user
5. Confirm "continue for AppleID '*****@example.com' to 'App'?"
6. Redirect responsed "400 Bad Request {"error":"invalid_client"}"

What is causing the error?

• verification

  • Using apple_client_token is jwt. We checked on https://jwt.io/ "Signature Verified".
  • The apple_client_token used in the request was correct.

• Original text(japanese)

Apple SSO response "invalid_client"