I've just been to check my 2-Step Verification settings on a Google account to see if I could remove SMS as a 2nd factor yet. I've been wanting to remove it for

I've just been to check my 2-Step Verification settings on a Google account to see if I could remove SMS as a 2nd factor yet. I've been wanting to remove it for a long time as I don't trust it. I thought I'd try adding a 'Security Key'. There was an option named 'Google' so I chose it to see what it meant. I was immediately presented with: Success! Security key added Your Google security key was added to your account. When you sign in with 2-Step Verification, you'll use your password and your Google. Make sure that Bluetooth and Location are on. When you're signing in, Bluetooth & Location are needed to check that your devices are near each other. Bluetooth pairing isn't required. Works only on Chrome Built-in security keys currently only work on Chrome So I'll use my password and my ... "Google"? I'm guessing this is related to the Google phone app, but if I go to add another security key I can see 'Google' is now disabled and it says next to it 'Last seen 8 February' ... but I've opened the Google app on my phone more recently than that, because I've used it for 2FA for this Google account before! I don't understand "Works only on Chrome". Is this saying I can log into Google on Chrome (desktop) by using the Google app on my phone? I've got 'Authenticator app' set up already (not using Google Authenticator - you can use the code it provides to add to Authy or 1Password or whatever you like). I also have backup codes as a paper copy ... so I think I might now be safe to remove 'Voice or text message' as a backup option, but I'm still wary of doing so.