Hi Leevis100.
welcome to this Apple (user-to-user) Community!
RE: "Apple TV shows spinning wheel when trying to play movies"
Sorry no-one has answered your question as yet. Am no expert, yet your question deserves a reply.
Maybe some of Apple Support's online articles can help us trouble-shoot.
You may need to check you are signed in to your Apple TV with the one Apple Account you use for everything
Apple. (you likely used it correctly to sign in here to the community, and for Messages, FaceTime etc.)
If needed: See: Sign in to your Apple Account on the web or in your device settings - Apple Support
Then, if you still have the same problem: You might want to check through Apple support's online article below
See what to do: If you can't watch or stream movies and TV shows in the Apple TV app - Apple Support
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Re: Apple TV (Gen 2 or 3, not too sure) : See how to: Identify your Apple TV model - Apple Support
________ If needed: See how to: Update your Apple TV - Apple Support
Resource:
Apple TV 4K User Guide - Apple Support