I found two issues to help solve this
First, if you are connected to another monitor through HMDI or the docking station you will not be able to connect to the wireless display adapter (even if your computer paired)
Second. If you have VPN there is a work around. But you have to disable the VPN indirectly.
- Go to the desktop, then right click on the little windows button (in win 8.1) and select Network Conections. You should Wi-Fi (and mine says Marvell AVASTAR Wireless-AC Network). Right click that and select properties.
- Next - uncheck Deterministic Network Enhancer and click OK
You can then close out if you wish
- You can now follow the normal nstructions and you will see the option to add Under Devices > Project and Add a wireless display. And it should now work if the VPN was your problem
OK - now you won't be able to use your VPN until you go back to step 1 and in step 2 recheck the Deterministic Network Enhancer and click OK.
I normally don't post, but spent days searching the internet and found this and give credit to the poster. at
http://www.nextofwindows.com/add-a-wireless-display-is-missing-in-windows-8-1-and-how-to-get-it-back/
Maybe I made it a little simpler to find the WiFi network connections. There are other ways that may be faster. One is to right click the little WiFi icon on the bottom right of the screen in the task bar in desktop mode. Select
Open Network and Sharing Center. Select Change Adapter Settings on the left of he screen, then right click the Wi-Fi. All the methods seem to take a few clicks to get there and uncheck that box Deterministic Network Enhancer and click OK (and later go back
and reset if you want to use your VPN over your internet connection). Seems like this is some sort of security setting the VPN vendors install. Good Surfing on your big screen TV (for me is a bigger screen for my Surface Pro 3 when traveling and some hotels
have TVs that are capable, or have a HDMI port and USB port.. and a controller that allows you to switch sources to that HDMI port (not all or even many do)