New Samsung TV remote does not completely respond

My LG died. I replaced it with a Samsung (4K) UHD 49 inch 7000 series.

The Cox remote lets me access my recorded content, and turns on the cable box. It allows me to fast forward/rewind. However, it does not respond to any non-cable commands such as power and mute/volume.

I have tried all the codes listed on Cox.com as well as several universal codes with zero luck. Do I need a different Cox remote, maybe?