Question for the PC experts

[Sam Vimes]

Every time I am on microsoft going onto Amazon account and putting in the email address and password they send me a code to my mobile to confirm because I haven"t got a Passakey yet .

Even if you set up a Passkey you'll still get an SMS with a code to enter.

Passkeys seem like a good idea but still have problems of security. For instance when I log on to my Google account on my PC and for which I have a Passkey, it logs me in as soon as I enter my email address. So anybody using my PC will get logged in. (If it's already unlocked). True I get a message saying was this you that logged in, but that's too late to lock any one out.