@glyph @feoh FWIW I'm getting the same this eve. If I try to actually log in to the account, I get full 2FA - on her phone. And there's no details or remenants of any of these "new" devices either in the mails, via the phone, or via iCloud on the web. So I'm reasonable sure it's some bug, but I'd prefer if Apple were shouting about it, pronto.