I went through the online chat, after much back and forth the only thing they offer are (to a regular user like myself, don't know about business accounts):
2- passcode you setup online, 4-8 digit number, in addition to your number, that is required for both online or in persona interactions with ATT support
1- "we will inform you before we transfer your number"
Even if you don't use SMS as a second factor, unless you regularly switch carriers, there's no downside to doing this.