Or if you have bought any titles from movies anywhere, join your Microsoft movies and TV account to that, and then you would be able to test playing in windows / xbox.
I buy a lot of movies / some TV seasons through the Microsoft website / from rewards site, and haven’t really seen issues watching anywhere. A few times (not frequently) it would not play and said I had network issues, but a reboot seemed to fix that. The nice thing with movies anywhere is if you find a better price on it somewhere else you have an account that you also link (prime, vudu, fandango now, etc), so long as the title was from a studio that supports movies anywhere you can basically build a library that you can play from any of the services. Vudu sometimes has better sales of stuff (though again you have to make sure it’s supported content), but I always watch using the Microsoft player.