Trouble updating payment method.
Just need to update my iCloud payment card number (old Visa was compromised); keep getting a "having trouble, try later" message. Tried on DESKTOP-IIULVN8 Windows , iPhone 6s and iPad 2.
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contact iTunes Support. Either use the form or scroll to the bottom of the page in the 2nd link. Follow through the screens to get a chat or telephone option.