I removed a channel Youtubetv that was not loading . I was hoping to add it back and fix the issue . Now that I removed it , it no longer shows up in the search so I cannot add it back .
You wont be able to re-add the YT TV app back as long as the Roku dispute with Google over YT TV continues.
You can access YT TV through the YT app: Open YT, select "YouTube TV" in the bottom left of the menu UI