Hi @Ke5,
Greetings from the Roku Community!
We understand you're having a problem with the Max channel since you're unable to sign in. After attempting the troubleshooting steps, and videos from other channels play fine. In that case, we suggest contacting the channel provider's customer support team to report the issue and get help. The channel developers themselves maintain channels on Roku. In this case, an issue within that specific channel likely needs to be addressed with an update from them.
If you need anything else, please let us know.
Kind regards,
John
John
Roku Community Moderator