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.
We would recommend logging in to HBO Max using your cell provider's credentials to avoid charges from Roku. To do this, follow the instructions below:
Launch the HBO Max channel from your home screen.
Open any show or movie of your choice.
Play the movie; then
The option to sign in will show up on your screen.
If still no dice, we would recommend reaching out to HBO Max Support to get help. Channels on Roku are developed and maintained by the channel developer themselves. They are the best ones to assist you with the functionality you're looking for.