Windows 10: Using laptop as second monitor via wireless display

What I want: Use my laptop as a second monitor at home. The laptop does not have HDMI in so I have to go wireless.

So I have both computers setup to use the connect app, have the settings configured under "projecting to this PC", both on the same network (desktop wired and wifi and laptop just on wifi). Both have the additional feature downloaded through the settings called "wireless display" or whatever it is called. Both on win 10 version 2004, latest updates all around. Both

The issue: With the connect app running on the laptop, it says "Ready for you to connect wirelessly" and "Protected content can't be viewed on this device" under that. On the desktop I can open the connect panel from the notification panel and all it shows is my connected monitor, no laptop. If I do the process in reverse as if I am using my desktop as the second monitor for my laptop it shows up in the connect panel on my laptop.

Anyone have any idea why I can see my desktop from my laptop connect panel but not the other (intended) way? I had this working about 6 months ago but never needed to use it until now.

Yes I have been searching for a while now but so much stuff is related to connecting to TVs, not between two computers & not having the same issue that I am on top of that.

I have tried using spacedesk but it visually messes with stuff on the desktop side too much for me to actually want to use it long term. Currently using a wormhole USB cable to control both computers with one set of KB & mouse but would rather just have the laptop be a second display for me.

Other 3rd party programs and options welcome. Spacedesk and an HDMI cord are out though.

TL;DR: Laptop says "ready to connect wirelessly" but does not show up on my desktops connect panel to select it. Did work 6 months ago, doesn't anymore. Win 10 2004.

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