I have Minecraft java, and have purchased dungeons, Mojang shop recognises that I have bought it, telling me so when I tried to repurchase it.   I have played dungeons on this pc , but the last time i tried to run it, it just says 'buy now' . I cant 'buy now' because the shop wont let me, saying 'I already own it'. I tried going on to microsoft store, and it says I don't own it.  

I have paid at least once for this game, and have never uninstalled it. So How do i access it?