Hello and welcome,
So, Wayfarer used to not have Apple ID as a login option; it was only recently that Apple ID was added. Previously, the only Wayfarer login options were Facebook or Google. When Wayfarer switched over to using Niantic ID for logging in, Apple ID became an option.
As I’m an Android user, I don’t use Apple ID. There was another user having issues with Apple ID and receiving emails, and I know staff did DM them with some additional info:
I would check to see if this article for Apple ID users from Niantic ID helps:
You can access Niantic ID online here:
https://my.nianticlabs.com/home
And more info on Niantic ID can be found here: