2FA SMS codes are delayed or not arriving after the macOS Tahoe update

IPHONE IS UP TO DATE, MAC M2 PRO UP TO DATE

2FA WAS WORKING BEFORE

NOW NOT WORKING

VARIOUS SITES THAT USE IT LIKE ATT, COX, CHASE BANK...ALL ASK FOR CODE BUT CODE NEVER COMES VIA SMS...THEY CAN SEND EMAIL CODE OK. SOMETIMES CODE SMS COMES HOURS LATER. SOMETIMES NOT.

MAC IS ON HIGH SPEED COX INTERNET HARDWIRE AND IPHONE IS ON AT&T WIFI CALLING CELL CONNECTION VIA INTERNET.

SEEN THIS BEFORE ON UPDATES AND AFTER SEVERAL MONTHS IT FIXES ITSELF ON MAC UPDATES.

IDEAS?

[Re-Titled by Moderator]

Original Title: 2FA DOES NOT WORK AFTER TAHOE INSTALL