when i tried to update my launcher it sended me to microsoft store

when i went there it said me to buy the game when i reinstalled the launcher this showed up

(Minecraft Launcher is currently not available in your account. Make sure you are signed in to the Store and try again. Here's the error code, in case you need it: 0x803F8001 )

what should i do i have mincraft java and purchased d it on site 

pls tell fast