The first time I go into the Marketplace following the 1.17.30 version update which fixed 150+ bugs, there is a bug! The Skins option within Categories is NOT selectable without first selecting Realms Plus or My Content. In other words, Minecraft does not recognise the change from, for example, Categories/Textures to Categories/Skins, or from Featured/Popular or from Genres/Fantasy to Categories/Skins. The Skins option is ONLY selectable after first changing the current page to Realm Plus OR My Content. A little simple Menu-tree testing of the new GUI would have found this within no time at all before release. This latest update made me join this Feedback site because I come across so many bugs... AFTER the latest bug-fixed update!
[As you can see, I even did the 5-minute testing myself in order to analyse the fault rather than just say "Skins don't work"].