Cannot log in to account because I don't receive the authorization code on my iPhone

I can no longer log into my AT&T account because I'm not getting the authorization codes on my phone. There is no option to send to email, only text to phone. I have an iPhone12 Pro. I just updated to the latest OS 15.4.1 in hopes that would solve the problem but it didn't. I also do not receive the 2FA codes from my bank and so cannot perform transactions. This also used to work but it stopped. I'm overseas and have 2 sim cards in my phone, but the 2FA authorization codes used to work fine in this scenario. I don't have the number blocked, I have my number enabled to receive Messages. I've rebooted the phone numerous times.