That's just the thing: I changed my Apple Account primary email following the instructions in your second link (which is where your first link links to for "ema

That's just the thing: I changed my Apple Account primary email following the instructions in your second link (which is where your first link links to for "email"). I even purged the old email completely so that it's not even an 'alternate' email anymore (which I shouldn't have had to do, and which made things difficult for me in other areas, but was Apple's only idea). Only Apple Card didn't get the memo and there's no way to poke them to make them update.