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.
I had a similar issue: Black screen launching HBO Max channel after signing up for the 1 month free trial through Roku.
Navigate to hbomax.com
Enter email address associated with Roku account
Reset password and login to HBO Max account
Restart Roku device
Launch HBO Max
I tried all of the channel install/remove, device restart, add subscription, cancel subscription nonsense posted on this forum. Clearly wasn't my issue. It appears to be a bad credential hand-off from Roku to HBO Max when signing up for the free trial. Once I verified my HBO Max account was active on their website, things worked well.
Same problem and it’s a new subscription. Just wanted to watch peacemaker. I turned off/on the Roku smarttv and I restarted it after deleting and reinstalling the app. I restarted the TV before reinstalling the app too. HBO and Roku are just pointing fingers. I checked for updated and app says it’s updated.
I got my HBOMAX app to work by downloading the app on my phone. I logged out of all devices. I changed my password using forgot password. I verified my email. I checked settings in the hbomax app. I looked at manage devices and subscriptions and everything was updated.
Yet the HBO Max channel continues to not work (Logo on purple screen briefly, replaced with black screen with three rotating dots at bottom. Screen disappears in about 30 seconds and I am kicked back to a Roku screen.)
I had similar problems. I watch HBO Max through my Roku. Apparently, I'd used a different email address for each of them. Changed my email address to match both and that seems to have cleared up my problem.