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Trouble setting a a Harmony 950 universal remote

I am having trouble figuring out how I can make a fairly simple system work with my Samsung Qled.  When I go into the Harmony 950 program on my computer I find that it doesn't list the optical audio out connection.  Does anyone know what it is called in the Harmony guide?  I have tried moving it to the HDMI 2 outlet and moving the AppleTV to the HDMI 3 outlet, but the remote doesn't seem to recognize it and turn it on.  Our sony Bluray DVD player is in HDMI 1 outlet.