@Trebdp83 – Thanks for the link to that Denon manual.
I did a quick search for 'remote control' and found that your Denon doesn't seem to have the feature mine has – that its remote can be set to operate a number of other devices such as TVs, BluRay or DVD players, etc.
However on pages 78-79, I did find something of possible use. Denon instructions can be difficult to understand. If you print out those 2 pages, and make sure you've set things exactly as the manual says, you might get something to work for you.
It is also possible that you have to change settings in the TV before it will cooperate with your AVR.