My end goal is to use my Harmony 700 to simultaneously operate my TV, Roku Ultra, and Denon receiver, at the same time. .

I listed all three devices & model numbers. I then set up all the devices under the Watch TV activity, then put in HDMI 1 (TV input) and Game (Denon port that Roku is connected to) and set volume buttons to only control audio on my Denon receiver. When I press the Watch TV button on the remote, everything turns on fine but when I try to move around the Roku screen nothing happens unless I choose Roku under my devices screen and then all of the Roku functions work fine. The problem is that I cannot operate my Denon volume when just the Roku is selected . I even went back and assigned some Roku commands to my Harmony remote buttons and still no luck. Can anyone let me know how to set up the activity so I can simultaneously use Roku to stream and my Denon receiver for volume without having to go back and forth between devices on the remote screen? Thanks in advance.