Discords automated bot detector or something related likes to think actual humans are bots sometimes. It will send a few capita human verifications then it will send a phone verification. When you get this you have to provide a phone # for them to text a 6 digit code for you to verify you're human. It won't matter if you have already set-up 2FA and all these other things it will still send this. The problem is you can only use the phone # once about every month, so if your alt gets the same thing they're basically disabling your account. People can use any phone # for it so they can link yours to abuse the discord staff will "Ban" that #. This will never let you verify your account again so basically, discord staff is deleted your discord account all for having a crappy phone verification.