Today I ran into several very weird issues with Apple Pay and Sequoia. It began when I tried to use Apple Pay from Sequoia. I got a message along the lines of needing to update contact settings and address, but no changes I made had any effect.
I'm not quite sure I've figured that out, but I have a hunch that the email address in "Wallet & Apple Pay" needed to match my iCloud address (which, is, due to longevity, a me.com or iCloud.com address). But that was grayed out and could not be changed. Google and AI searches didn't help.
The fix was actually pretty easy. If you have "Hide My Email" enabled the Email setting cannot be changed. It will be grayed out. I don't think the UI makes this relationship clear, and it is not obvious to me why enabling hiding was incompatible with a change to an email address. But it is.
Turn off "Hide My Email" and see a list of all the email addresses that are part of one's Contact.app "My Card". Yes, the "My Card" is yet another part of a large set of really obscure things that can go wrong with Wallet, Apple Pay, and, indirectly, the App Store and media purchases.
So ... turn off "Hide My Email" and you'll see a list of emails associated with your "My Card". I don't think you can actually choose just any email though. I think you want to choose iCloud/me.com email.
Anyway, as I noted I'm not done sorting out Apple Pay issues, but at least I can tell you how to change your Wallet associated email address. For now. Until Apple fixes this weird UI -- which is basically a bug.
