Apple TV app on Mac doesn't show HBO Max, Hulu, or Amazon Prime as an option under "How to Watch".

When Apple launched the Apple TV app for iOS and Mac OS it was stated that you could watch all your services in one place (https://www.apple.com/apple-tv-app/). That is true on the app on iOS but I can't get any of the third party options to show on my Mac. When I search for a show in the Apple TV app on my Mac the only option it shows under "How to Watch" is to buy the show or stream it through AppleTV+ if it's available there. Is there a setting I'm missing or somewhere to link these accounts?