I am trying to connect Samsung Dex wireless from phone to pc and it keeps saying couldn't connect to pc try again and yes i do have samsung dex downloaded onto my pc and wifi is turned on. It works just fine with my s10 plus.
I have never tried to connect wirelessly to a PC. It connects wirelessly to a TV with Miracast functionality but with a PC it is a cable connection only.
Took me about five minutes to figure this out yesterday and connect. Hardest part was finding the Dex app for the windows laptop. So I opened the owner manual and searched for DEX and there was the clickable link. After that it worked great. I'll remain using Your Phone Companion for messages, notification and downloading photos from the phone to the computer since it automatically connects.