HBO Max purchased on Apple TV (Set top Box) not appearing in Apple TV app

It works as intended. The HBO Max app is not available for Mac, as browser access is the regular way to access that on computers, same as for most other third party streaming services (Netflix, Prime Video, Disney+, etc.).

The linking between the Apple TV app and third party apps is supported on iPhone, iPad, and Apple TV box, but not Mac or third party devices.

Hi there Sharper2021,

We understand you're experiencing an issue with accessing your HBO Max subscription on another device, and we'd like to share some resources that can help.

Get started here: See or cancel your subscriptions

Review how to sign in and watch on your Mac here: Which devices work with HBO Max?

This page may also help: Subscribe to Apple TV+ or an Apple TV channel in the Apple TV app

We hope this helps.