Access to my main email account (outlook) is currently blocked because someone decided to try a password from some earlier leak and locked it. It can only be unlocked with SMS MFA, which I can't use because I'm travelling abroad. There is no other way to do it. The other option they give you a form that only works if you don't have MFA set up (it says so on the faq). I even asked someone to fill the form from my home computer so the location data matches earlier accesses, but didn't work. You also can't contact support without logging in. If I had lost/changed that phone number for any reason, I would lose access forever. Luckily I will be back home soon.