The source audio must be optical to the 2807 for there to be optical out.
The 2807 is discussed in the following thread --> https://www.avsforum.com/forum/90-r...rs/649509-official-denon-avr-2807-thread.html
The 2807 is discussed in the following thread --> https://www.avsforum.com/forum/90-r...rs/649509-official-denon-avr-2807-thread.html