Technology
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I can't answer your question but it's particularly annoying for me because I travel a lot for work. Sending me an SMS message when I'm in the middle of Africa isn't going to work. (In fact I found a way to make it work by enabling wifi calling with my US cell provider.. but I shouldn't have to jump through hoops to verify my identity)
I also used to run into this when flying for work I would have paid for wifi on a plane flight but my mobile device isn't able to get their text or push notification because I only paid for my laptop to have wifi. Used to drive me crazy and then I just stopped working while on flights because of dumb policies.
That's why you use an Authenticator app that gives you TOTP offline.
That's exactly what this thread is about. When companies don't provide that as an option.
If a service you use does not offer TOTP but implements their own 2FA through another method, you have no choice to use it though.