At the moment I'm busy integrating Sign In with Apple in Zotonic (https://zotonic.com).
What I discovered is that access to the REST api end-point can be very unreliable. The development server I use sometimes can't access the end-point for hours because it rejects incoming connections.
$ curl https://appleid.apple.com/auth/keys
curl: (7) Failed to connect to appleid.apple.com port 443: Connection refused
Is this a known issue?
How can clients fix this issue? Is there a form they can fill out to unblock their server's ip-address (like microsoft has for delivering mail)
Regards,
Maas