Hi, thank you for reaching out to the Microsoft Q&A forum. I’m happy to help.
What specific game are you trying to download from the Microsoft Store?
I suggest logging out and then logging back into your account in the Microsoft Store, and then try resetting the Store cache.
Press Windows + R, then type 'wsreset.exe -i' (without the quotes).
Click OK, wait 10 seconds, and then try checking again.