Why doesn't my TV show up in list of devices w/o being cut on

I frequently cast from youtube (mobile) to my TV. I am able to  easily cast to two other TVs in my home without having to power on the devices (it automatically comes on when I cast to it). I have a new tv in my bedroom, and a newer TV upstairs. These two TVs are the newer devices (most recently purchased) and do not appear in the list of devices. 

I will admit, I had this issue with the TVs that do show up on list now, but the issue resolved itself.

Is there a specific setting that I need to modify so that my TVs show up on list of devices without me having to cut them on manually? 

I modified saving bandwidth setting thinking that was it, and also the setting regarding automatically cutting on when a connected device is powered on.

Neither of these modifications seem to have an effect. What do I do?

Below is the screenshot of 2 of 4 devices. This is what I want to happen for all of my Roku TVs.