Same issue for me. Customer service had no idea how to troubleshoot. They even called Apple who confirmed there’s no problem with the card or Pay. I even switched to a different (non-Apple) card in Pay and same issue on T-Mobile’s site. I’m able to shop online using Pay with either card, just not T-Mobile. I think it’s clear where the problem lies. As others have pointed out, I think it’s poor that this problem has been going on for weeks and T-Mobile’s customer service seems not to know about it
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