Re: Error Code Media Not Allowed 0066: Account not found for requested client
Two possible considerations come to mind:
Games in the ESPN channel app that are marked with an ESPN logo require a subscription to a paid "tv provider" account that includes ESPN, and a login using credentials for that account.
Games in the ESPN channel app marked with an ESPN+ logo require a separate ESPN+ subscription.
Some tv providers may include both subscriptions at once. I was just reading that Hulu Plus Live TV does, there could be others.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X
For the issue you're experiencing with the channel, we recommend contacting their support team directly for more information and better insight into how their channel works on Roku. They'll be the best ones to help you out with that matter.