Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Re: Cant find HBO or HBO Max on my channel list at all
Which model number of Express? You can find it in the about screen if you don't have the original box. It's possible you may have an older model that is not supported. I also have to assume you are in the US?
That just shows featured channels with no HBO listed
That indicates you are in Great Britain. Apparently Max isn't available there. And just because it might be available on other devices doesn't mean it is available on Roku. That's under the control of HBO, not Roku. Only HBO can make a channel available in a particular geographic location.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.