Ah I thought so (annoyed)
I don't think you can swap rewards points for other countries' store credit.
I have microsoft rewards points for £5 off. Do you think I could use that on this game and get it for £2.73?
I brought it last week with Reward Points, was about £12 I think.
I think it's worth buying, especially considering the price it is now and the enchancents done for series x/s (if you have one ofc)