Audio Passthrough via Line In?

Ive got two pcs, one Desktop and one laptop. Both are running EndeavorOS. though the laptop is Budgie, and the Desktop is KDE Plasma. Not sure if thats relevant to the situation at hand. But Im trying trying get the sound from my laptop to pass through Via the line in of my desktop. That way when im running full screen applications on my monitor I can stream audio, video, youtube on my laptop and listen to it through my headphones plugged into the Line out of my desktop. How would I go about doing this? Ive tried playing around with it in Pulse Audio, Pulse Audio detect that Ive got a line in producing sound i believe. But I cant get it to play through my output

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