Autopayment AT&T validation of card not possible

I tried to set up an autopayment for AT&T with my revolut card. The card has enough funds.

I went to the store and they started the process through swiping my card. Somehow, instead of reading my first and family name, it would only say PERSONALIZED.
When entering the credit card number, cvv code and my home address, their Programm would not be able to validate the card. Why, and what can I do?

Hi there. Do you know if AT&T supports prepaid cards?