For Google 2FA, I'm pretty sure that it lets you remove the phone number once you've added a 2nd 2FA mechanism. Eg, once you've setup Google Authenticator
and a Yubikey. At least that's how it worked when I set it up a while ago.
Given that Ted uses OpenBSD, I'm surprised that he has not mentioned the dumpster fire that is U2F on Chromium for BSD. This bug details the issue: https://bugs.chromium.org/p/chromium/issues/detail?id=451248. The last I checked, (~2 months ago), it was still a problem on FreeBSD. In order to avoid the crashes, I needed to set a user-agent spoofer to Firefox, so that I would not get a u2f prompt (and would instead be prompted for a Google Authenticator code).
That became frustrating enough that I decided to try switching from Chrome to Firefox so that I could use my Yubikey. I had to setup a u2f plugin for firefox to use u2f on FreeBSD. And to even get u2f requests, I had to install a user agent spoofer, and spoof a chrome user agent. Argh! So now I was spoofing Firefox on Chromium, and spoofing Chrome on Firefox. My head was spinning, and (because the spoofer spoofed old agent strings), I was getting nastygrams from corp. sec. for running out of date, insecure browsers.
I finally just threw in the towel, and set up a Linux bhyve VM to run Chrome under linux. The performance sucks, but at least I can finally use my Yubikeys. On the plus side, I can use PCI-passthru to pass in a webcam, and actually do hangouts on my desktop now.
Given that Ted uses OpenBSD, I'm surprised that he has not mentioned the dumpster fire that is U2F on Chromium for BSD. This bug details the issue: https://bugs.chromium.org/p/chromium/issues/detail?id=451248. The last I checked, (~2 months ago), it was still a problem on FreeBSD. In order to avoid the crashes, I needed to set a user-agent spoofer to Firefox, so that I would not get a u2f prompt (and would instead be prompted for a Google Authenticator code).
That became frustrating enough that I decided to try switching from Chrome to Firefox so that I could use my Yubikey. I had to setup a u2f plugin for firefox to use u2f on FreeBSD. And to even get u2f requests, I had to install a user agent spoofer, and spoof a chrome user agent. Argh! So now I was spoofing Firefox on Chromium, and spoofing Chrome on Firefox. My head was spinning, and (because the spoofer spoofed old agent strings), I was getting nastygrams from corp. sec. for running out of date, insecure browsers.
I finally just threw in the towel, and set up a Linux bhyve VM to run Chrome under linux. The performance sucks, but at least I can finally use my Yubikeys. On the plus side, I can use PCI-passthru to pass in a webcam, and actually do hangouts on my desktop now.