Why can't I program my soundbar with the slim line 2 remote?

[Mekano]

I have a Samsung soundbar but it won't sync with my remote. I can turn the TV (samsung) and box off with the telus remote. I have to use the sound bar remote to adjust volume. If I'm unavailable to sync I guess I'll deal with it. I've tried all the codes in the book. 

Also when I sync my other TV (insignia) with the slim line 2 remote I also can't adjust volume without the actual TV remote. I feel I should be able to adjust the TV volume with the telus remote, if I can turn it off and on the with the same remote. 

[NFtoBC]

The remote does not work with all auxiliary sound systems. We connected our sounder system via the optical connection to the TV. It automatically comes on  with the TV and volume is controlled through the TV. 

[Mekano]

Ok I can accept that, but why won't my other TV which is just TV and telus box. Why can't I program the remote to adjust the volume. It'll turn off TV and box but I still need the TV remote to adjust volume 

[NFtoBC]

Brand name of TV?

[Mekano]

Samsung TV with Samsung sound bar. Connected with optical cable. 

I just spent 1hr on the phone with telus and none of their codes work. Guess I'll just have to use 2 remotes.