GP is saying they're using an authenticator running on the computer they're logging in on (they alt-tab to it from the browser). So they have two factors in the

GP is saying they're using an authenticator running on the computer they're logging in on (they alt-tab to it from the browser). So they have two factors in the sense of "something you know" vs. "something you have" but in this case the something they have is the same device.