Let's perform a troubleshooting step, as this appears to be a browser-related issue, mguiller.
I recommend clearing your cache and cookies, as old, corrupted, or incompatible data stored by your browser can interfere with website functions. You can also try to access your account in different web browsers if the issue is with your current browser; using another one (like Chrome, Firefox, or Edge) can often bypass the problem.
After following the troubleshooting steps, you can try to update your payment method in QuickBooks Online Self-Employed (QBSE).
If you have any further questions about QuickBooks, feel free to leave a comment below, and we’d be happy to assist you.