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.
Did you accidentally sign up for a HBO Max subscription on Roku or HBO Max? We would recommend checking your subscriptions online at my.roku.com and clicking Mange your subscriptions to make sure you haven't.
For more information about that channel's subscriptions and account information, you'll want to contact HBO Max support directly to inquire further. Many channels on Roku are developed and maintained by the channel provider themselves.