Given that I do not use Movies Anywhere app, I suggest that for any doubt about that app you'd better ask their developer team, after reading all the features listed in this preview page:--> https://apps.apple.com/us/app/movies-anywhere/id1245330908, specifically these paragraphs:
Purchase from your favorite places*, and Movies Anywhere will bring your favorite movies together into one synced collection – for free.**
....
Creating your Movies Anywhere account and bringing your favorite movies together is free – you only pay for the
movies you want to add to your collection.
....
*From participating retailers only: Apple TV, Amazon Prime Video, Vudu, Google Play/YouTube, Microsoft Movies & TV, Xfinity, Verizon Fios TV, and DIRECTV....
The only thing I can state is that your iPad Pro 5th gen meets the requirements to run that app.
Regards
Giulio