Question laptop as a second monitor using Miracast

Apr 8, 2022
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I am trying to use my laptop as a second monitor. I have done this in the past when both the PC and Laptop were running Windows 10. The laptop has now upgraded to Windows 11 and I can't get the projection to work. Is it a requirement that both machines have to be running the same OS?
 
I may just be confused but the article seems to show how to project from my Laptop (Windows 11) to my PC (Windows 10). I need to go the other way.

I've followed the instructions here
https://www.windowscentral.com/how-use-your-laptop-second-monitor
My problem is that when I get to the last step "Connect to a wireless display", the Laptop never shows uo to be selected. Both machines are on the same wireless network. I checked that through the router.
 
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