I attempted to add a new credit card to my account using my console last night and kept getting a message about xbox "not having authorisation". The details were 100% correct. I tried again on the xbox live website. I select "manage payment options", "add new credit card" and am sent to a page telling me my session has expired. The same thing happens when I select "pay with paypal", although sometimes it just sends me back to the xbox.com homepage. The same things occur when I click "add points" and follow the prompts.
Is this an isolated issue? Is the problem on my end or Microsoft's?