Had the same problem.
Tried to make payment but the page just hung; I then noticed an email confirming payment.
However, the Sports Pass is still not active so I have paid the fee but still can't watch the game.
Got in touch via live chat and was told to wait for an email to confirm this technical issue has been fixed.
Exactly the same issue and my son has now missed the Arsenal game which was the main purpose of purchasing the pass 😡
Very infuriating and disappointing for my son and would like to know what will be done about it.