@533, so it sounds like your subscription is through Roku to the AMC+ standalone channel/app. That would explain why you can't access it through "The Roku Channel" (they aren't the same thing). I don't know what's happening and I'm not sure if Roku or AMC+ is to blame (or both). If you highlight the AMC+ channel/app on your Home Screen and press * on your Roku remote do you get an option to "Manage subscription" or an option to "Remove channel"?
Generally, you won't get the option to "Remove channel" if you have an active subscription through Roku (you get the option to "Manage subscription" instead). I'm not sure what exactly what "I turned off the auto renew feature" means. Is that an option on the Roku website? Pardon my ignorance, but I don't subscribe to anything through Roku in part because of the issue(s) that you and others are having. If you cancel a subscription you should still have access until the end of the already paid period.
If you do get the option to "Remove channel", choose it. Then restart your Roku by choosing the "System restart" option under Settings->System or Settings->System->Power, as appropriate. Once it restarts, add the AMC+ channel again and see what happens.
You shouldn't have to log into any channel if you're subscribed through Roku, so that makes me want to point the finger at AMC+ for not automatically recognizing your subscription.
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