Pixel 5 user here also. I called customer support, the first agennt couldn't help me. They escalated me to a supervision (Shawn in Canada). Shawn disabled the "Premium Messaging Block". I then had to reboot my phone and after start up go to settings-->system-->advanced-->reset options-->Reset Wi-fi, mobile and bluetooth and then "Reset settings." After the above steps were completed, the MFA texts are now coming through To summarize what worked for me: Step 1: Call Xfinity mobile and have them remove the "Premium Messaging Block" from your account Step 2: Reboot phone Step 3: Reset Wi-Fi, mobile & bluetooth
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