Xbox ames Log In issue

[KM2612]

So I upgraded to win 10 yesterday, and today I downloaded Halo Spartan assault on my Desktop. And everytime I try to run it, I am facing an error message saying "to use this app, you need to log in using the Microsoft account that was used to purchase it".

Strange because I am suing that account only. So I thought of turning on my Xbox app, synced the app, loaded it again and voila...same issue.

Anyone knows how to work this out?:sweaty::sweaty::sweaty:

EDIT: Have uninstalled and Re-installed, restarted the system, still to no result.