My elderly mother accidentally created a passkey (in Chrome) for one of her accounts. Normally, I try to keep a copy of her accounts and passwords in case she forgets them so I can help her out. With the passkey, this is impossible.

She doesn't know how she created one, she doesn't know what it is, and I don't know how to explain to her that if her PC dies I won't be able to help her log back into her account. I'm not even sure how I'm going to migrate this thing to a new PC for her.