Can you please specify the issue you are experiencing? How are you subscribed to Acorn TV? Did you pay for your subscription through Roku Pay, or did you subscribe to Acorn TV directly? In addition, how are you trying to access the Acorn TV content? Are you accessing the content through The Roku Channel or through the channel directly?
With more detailed information, we will be able to assist you further.
I am having the exact same problem with the same error code. I renewed through Roku. (I am using the Acorn TV channel not through Roku. I double-checked under Roku Channel to see if I could watch it there. I could not.)
The Acorn TV channel menu under Manage Subscription (press asterisk * for menu) says my Subscription is current but will not play. Acorn TV's website says I haven't renewed my sub.
I contacted Acorn TV for support several days ago without getting a reply. I will go ahead and follow your guide to renew through Acorn TV's website itself.
Hopefully this will bring the matter to Roku's attention and they will reach out to refund the renewal price they've already debited from my account last week.