Hi there! Payment method errors causing unsettled accounts are really frustrating! Here's how to fix it: go to Ads Manager → "Payment Settings" → remove the problematic payment method completely, wait 24 hours, then add it back fresh.
Make sure your payment info exactly matches your bank records - name, address, everything. Try a different payment type if possible (credit card vs debit card). Check "Account Quality" for any warnings that might be blocking payments.
If it's still failing, clear your browser cache or try adding the payment method from a different device/browser. Sometimes it's just a temporary sync issue with Facebook's payment system.
I've seen this resolved 80% of the time by the remove-and-readd method after 24 hours.
What type of payment method are you trying to add, and have you tried the 24-hour reset approach yet?