I’m having the same issue. I cannot update the billing address section and any attempt to pay for a domain renewal immediately fails. On a whim, I opened the DevTools in Chrome and watched the traffic as I clicked the Renew button. The page gets a near immediate “422” back from Cloudflare with the following error message:
{“result”:{“code”:13,“message”:“Quote error: failed to accept quote in stripe”},“success”:false,“errors”:,“messages”:}
Are you seeing the same thing?