Hi Community users,
Thanks for posting in the Roku Community in regards to the issue you are experiencing with HBO Max.
We recommend performing the below steps and seeing if you can resolve the issue:
1. Remove the channel from the Roku device.
2. Power cycle the Roku device by disconnecting it from the power cable and reconnecting the device back to power.
3. Re-add the channel back to the Roku device.
Steps to remove and re-add the channel can be found here:
How do I remove channels from my Roku® streaming device?
How do I add channels to my Roku® streaming device?
Each channel (app) on the Roku platform is built and maintained by the channel provider itself. If you encounter an issue within a channel that isn't occurring in every other channel on your device, you'll want to contact the channel provider directly to report the issue and request additional support. They’ll be able to best assist with any issues that are occurring within their channel.
Please feel free to let us know if you need any additional assistance!
Best regards,
Arjiemar