Error message when trying to sign up for DirectTV Stream

I have tried multiple times, using all my cards, to sign up for stream service and get an "Oops something went wrong" code when trying to make payment. I have gone to the AT&T store and they get essentially the same error - code 481. I have spent two hours on two separate calls trying to get resolution. Absolutely no luck. I have never tried so hard to buy a service before.