Unable to update credit card expiration date

I tried editing the payment methods making a change to the credit card expiration date.

After clicking confirm, the dialog box disappears without confirmation and the expiration date remains unchanged.

Same with Firefox, Chrome and Edge.

Looking at the support page, it seems I am following the script to a tee.

Looking forward to hearing of how to get this done.

AFAIK there currently are some issues with the payment UI. It probably is best to open a support ticket at https://support.cloudflare.com/requests/new

Workaround: Edit in a private instance of Firefox (71.0).