Question / Help STREAM HELP!

Ok here is my issue. I'm new to streaming, been following all sorts of guides and what not but here is what iv'e run into. Im streaming fortnite from a PS4 Pro, using an Elgato HD60 S, with a Blue Yeti Mic and Astro A40's TR w/ MixAmp. I can hear in-game audio and it is relayed through my stream which is perfect, but I can't hear game chat or speak through game chat.
The way I have everything wired is my PS4>Elgato>Pc
The Astro A40's I have the headset jack run to the mixamp jack, and the optic cable run from the mixamp to the ps4 pro, and then a usb run from the mixamp to the pc for power.
Everything works fine with the exception that I cant hear game chat or speak through game chat while playing but i can speak and it goes through the stream. I know that since I dont have a mic plugged into the playstation thats why I cant speak but why cant I hear anyone when i have the optic cable plugged into it and my headset plugged into it
 
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