What error do you get?
I have no idea why the membership can't be purchased with points... but its very odd that a card would be valid for points but not the XNA membership..
There are some issues with debit cards see
http://support.microsoft.com/kb/911113/?sd=xbox but I would expect that if you can buy points you should be able to buy other memberships.
Is possibly this:
Your debit card cannot have restrictions on subscription-based or Internet purchases. Memberships are subscriptions based services which repeat every year or 3 months. So some debit cards don't allow that.
Please be patient - having problems like this is rare. The XNA team probably won't be able to reply till Monday
And yes I wish Microsoft (and every other company in the world) would realise that customer support is not the place to hire unqualified, minimum wage people.. half the time when you call they have never even heard of XNA.
Play Kissy Poo - a game for 4 year olds on Xbox and windows
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