Marketplace pages not loading

Hi. I am trying to purchase a texture pack for my Minecraft realm. But not matter which pack I choose, when I click on "get this item", the corresponding page does not load and stays blank (see attached screenshot).

Windows is up to date, region/time/date are correct, windows cache emptied. 

I've purchased a realm subscription yesterday but will obviously ask for a refund if I can't install any mods. 

Thanks for any help offered!