Not sure about what you are trying but I bound the TV input focus command to a F-key on my MCU and that seems to only work when it feels like it. I think it is to do with where the focus currently is, which rather seems to defeat the point but.........
.......for what you are trying to do, I have a word. The word is........drum roll........fanfare....................... Screensets.
Two of mine are TV & Buss view.
My SS4 is a CV on the left monitor showing only tracks + master buss, Centre monitor has the TV with only tracks showing.
SS5 is identical but with only busses showing in both views.
Of course a single monitor combined with the 'D' key and CV in the multidock is almost as quick.
Switching between them is automatic for me now and far quicker than showing the buss view and dragging it up or any of the 'older' methods.
HTH