The Apple TV app on third party devices (such as LG TV or Google Chromecast) doesn’t offer Max content directly, nor does it offer that external apps “connect” to the Apple TV app for inclusion of content in Watch Now, Up Next, or Search. That latter functionality requires special support from the OS/ platform, thus only on Apple devices
11. HBO Max will be available to view on all Apple devices from launch, with the video streaming service set to work on iPhone, iPad, iPod touch, and fourth-generation Apple TV devices from May 27
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