Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
Hello David,
Regarding the error messages that you've provided me, I'd like to ask if there any changes made to your account before the issue started. Also, do you experience the same behavior when accessing your account using a different browser? Lastly, are you able to access the affected account using this link?
Since you're encountering a problem when changing your Credit Card information, we would highly suggest contacting our Microsoft Accounts & Billing through this link. We have a dedicated department that can assist you further.
Should you need further assistance, feel free to post back to Microsoft Community.