There are no more codes for private channels. Roku turned that off several years ago due to abuse of the functionality. You cannot add "adult" channels to a Roku any longer.
It's just another reason to not get a Roku. Get a Fire TV Stick and you can add adult apps and it even has a web browser so you can visit adult sites.
Welcome, and thank you for posting here in the Roku Community, @onebrushfinish!
We appreciate you reaching out for support. We'd be happy to provide further information about this.
In addition to what our Community Expert provided above, please be aware that the adult channels are not available/ not being supported on the Roku streaming platform due to restrictions.
Note: Never post any personally identifiable, private, or sensitive information publicly, including passwords, email addresses, or payment information. Community content is visible to all Community members.
Thank you for understanding.
Warm regards,
Carly