Apparently not all content is available on Roku AMC+/Shudder, versus stand alone AMC+. This movie is not available on the Roku AMC+ channel but it is on the stand alone AMC+/Shudder. I'm watching it now on Shudder on a separate free trial. I don't see the point in having subscriptions through Roku if you can't access all the content on the app you subscribed to.
Adding that there is a movie called Mayhem on Roku AMC+, but it was released in 2023. I'm not referring to this movie.
