Program remote control with Denon receiver

We received a new tv box and remote control in January.  The programming of the remote control hung part way through.  I have been able to program the remote control partially to where I can change channels and the volume with the remote control.  We can’t use the voice portion of the remote control.  When I use the power button, the tv does turn off, but turns back on within a few seconds.  I have tried going through the menu choices to pair the remote using the voice remote pair option.  However, it hangs scanning for devices, I’ve wait over an hour and never moves forward.   I have tried following the directions from the link:   https://www.xfinity.com/support/remotes.  I have also tried resetting the remote to factory settings and starting again.  Any assistance would be greatly appreciated.