Using Chrome browser on my Win 10 PC, my TIVO BOLT shows up on the list when I click on the "Cast" icon. When I select the Bolt to cast to, what mode does the Bolt need to be in to display the "casted" screen?
I just experimented and cast a YouTube.com website video open on a tab on a Chrome browser on my Win10 networked laptop, to my networked TV, using the option for my TiVo Bolt box connected to the TV, listed under the available cast destinations after I clicked on the YouTube cast icon (likewise when I used the Chrome menu option for this) (I also had the option of the TV itself). No issue, and the TiVo box wasn't set to anything special, simply acting as the OTA signal input source for the TV, for a currently-showing TV show; when I played around some, it also worked when I was at the TiVo My Shows screen and likewise when a recorded show was being played back--the casting just took over the screen.
(I wasn't sure if this is the sort of use case you were asking about.)