Enable short code texts from bank

I'm unable to receive short code texts from my bank (US Bank) since switching my service from AT&T to Xfinity Mobile a few days ago, thus cannot receive 2-factor authentication codes from my bank to access my account via the US Bank app or online via the web. US Bank's error message indicates that I need to contact my carrier and ask them to enable short code text messages from 872265. An Xfinity chat agent said that Xfinity doesn't block any short code text messages and insists the issue is with my bank, verified that my account has no blocks or anything disabled in terms of text messages and premium messages. But I saw elsewhere on this forum that Xfinity Mobile customers are encountering this problem with lots of banks, so it's clearly not an issue with any one bank but rather with Xfinity Mobile as a carrier and settings that allow short text messages from banks. The Xfinity chat agent provided me with an Advance Support Team phone number, 866-447-5048, so I will try that next. This is a HUGE problem, if it can't be resolved I'll have to switch back to AT&T.