@Shyria Yup! I saw people's screenshots of their Nook Stop but mine doesn't have that tab/category for some reason still :<
@Underneath The Stars Yeah! I stopped playing long before too but I know people who picked up the app literally just for the items and it still worked for them lol. Basically, in the Pocket Camp app they'll give you a code in the rewards section IIRC, and you just have to put it in your Nintendo eShop and download the items, then supposedly the items will be purchasable at the Nook Stop.
I've tried restarting my game too but that hasn't made a difference either. Might just have to contact Nintendo support, running out of ideas lol.