Yeah, it's a needlessly silly requirement to mandate the use of the older system. Especially as they actively encourage you to buy older games through backwards compatibility.
Ah ok, I got rid of my 360 ages ago.
You can but you need to do it on the xbox 360 itself. On the xbox store it won't allow you to use credit for 360 titles.
Can you buy 360 games with rewards points? I thought it was only xbox one games, xbox live etc.
Thanks. Will pick some up with ms rewards points.