Just encountered this error message "Close HBOMax An unknown problem occurred. Please contact your TV provider." I was trying to watch a series, and the screen asked me to create a password for HBOMax which I did. Then when I tried to watch the series, it gave me the error message above. I re-started the router, and updated the Roku software and still no luck.
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HBO Max worked fine when I was subscribed thru Amazon Prime which they stopped the service for. So I then subscribed thru ROKU TV, and it wont work, It says unknown error has occurred please contact your TV provider. Tried all the suggested fixes, nothing worked so far. The only part that functioned is that they took my money.
I am happy to hear that I am not the only one having this issue. Since those who purchased outside of Roku seem to be okay, this definitely seems like a Roku issue. Like all of you, I created a password and purchased it through Roku after my Amazon Prime membership ended. I have been getting the same error no matter how many of the troubleshooting steps I try. Obviously, since I purchased it through Roku and have an active subscription, deleting the app and downloading it again isn't an option.
If you're only experiencing the issue on HBO Max while other channels play fine, contact the channel provider's customer support team to report the issue and get help. Channels on Roku are maintained by the channel developer themselves. In this case, there's likely an issue within that specific channel that needs to be addressed with an update from the channel developer.