Originally Posted by Camatt

Under the Manage Profile section of the primary AT&T user’s account there is a Privacy Choices tab and one of the options there is: Identity VerificationAllows us to help non-AT&T companies perform identity verification and fraud prevention. Ours were all set to Off. switching to On allowed me to get the 2 factor code needed to access the transfer miles section of Capital One.
I didn’t believe it was my cell carrier’s issues as other commenters have suggested but the more I read the fine print of the cap1 TFA page I realized they were not just sending a code to my phone like they do with a basic log in, they were asking my cell phone carrier to verify me. Kind of like getting a bank guarantee to do a financial transaction at an investment company. Hopefully other wireless providers have similar permission settings that can be turned on.
post script: Turkish Air is telling me there are no business seats available but I can go to their website and book businesses seats! Aargh. Now for the frustrating calls with Turkish air😖