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It’s a notification pop-up the Google mobile app can send, asking for login confirmation.

I see, but doesn't have the same issue as sending an SMS to the phone if the phone has been stolen in that the thief can just say "yes" to the prompt?

No, it's not quite the same issue. SIM swap works remotely without anyone getting a hold of my phone.

A stolen phone can of course be a problem as well, but at least it's somewhat under my control and I may notice pretty quickly when it's gone.

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