I'm trying to figure out where to go to update the return URL for signin with Apple, I already have a key and identifier created for it and now when I try to edit either it doesn't give me the option to change the return URL.
I tried deleting the identifier but got an error stating "The bundle 'XXXXXXXX' cannot be deleted. Delete all the Apps related to this bundle to proceed." - but not sure what they mean by apps related to this bundle, and I deifnitely don't want to delete the app I created just to unassociate signin and then reassociate it with new return URLs.
Figured out the issue, Apples 'Identifiers' URL has pretty bad UX, I had to click on the dropdown called 'App IDS' and select 'Services IDS' to bring up the services and update the return URL.