[fallenasleep]

Similar to other 3rd party signins, you get redirected to an apple signin form, and then redirected back.

Disclaimer: opinion/ venting my personal frustration ahead

Apple's implementation of the OAuth flow is incomplete (even compared to what their documentation says is possible) and buggy. We've found it very frustrating to work with. This may be one reason that widespread adoption of apple signin is taking a while.

Of course I expect the issues will be resolved with time