Fios installed 2 weeks ago.
I have a silver cable box in my bedroom. For some reason I cannot control the TV volume through the "silver" cable box/FIOS remote.
My settings are set to "varable." I tried "fixed" & it is still the same.
When I use the remote volume, the sound stays the same no matter how high I turn it up or down. Same w/Settings.
However, I can control the TV volume by using my TV remote.
Using the cable box to turn on both the box & TV at the same time works just fine. No issues there. Just the cable box/FIOS remote volume. I would like to control my volume through my cable box.
As it stands now, I have to keep my TV remote & box remote together. 
TV is Toshiba if that makes a difference.
Would appreciate help here before I call tech support.
FWIW.....
I have a "black" cable box in my living room. No issues w/controling TV volumn through my cable box/FIOS remote.
Living room tv - Samsung
Bedroom - Silver cable box - Toshiba TV (not a smart tv).