Yeah, I personally don't subscribe to anything that requires a payment, so I don't have experience with those services. I did have a Peacock subscription once through my Xfinity Internet account, but they terminated that agreement so I removed the channel/app. I get MAX included with my cell service, and have no issues logging into their app on my Roku and Shield players using those credentials.
I just looked through The Roku Channel using the web access, and you are correct Peacock is not listed there. So assuming your correctly show a subscription to Peacock TV on your Roku user web page (https://my.roku.com) there should be a way to access Peacock TV on your Roku device using their app. Interesting thing, I can't log into my user account right now, so perhaps Roku is having an issue with their site and that might be the problem with your access to the app.
I also did a search of the Roku site, and I'm not certain they offer Peacock as a subscription. So if you have subscribed to Peacock somewhere, it might not be through Roku. I do know the Peacock TV app on Roku does offer logging in to an existing account, but you'll need to know what credentials to use to log in, as your Roku credentials are not likely to work.
Dan
Roku Community Streaming Expert
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