After 4 hours of trial and error, well done Satya....It turns out that facial recognition on the laptop doesn't play well with Windows App Mobile authentication. In order to get an iPad to connect with your Windows 10 Pro laptop via Windows App Mobile, you need to make sure that your laptop is set to just the password authentication method. If you are currently getting in to your Windows 10 Pro machine via facial recognition, the Windows App Mobile will not authenticate with your machine. Make sure to reboot your machine after setting it to the simple password recognition and then try to authenticate again between your iPad and the lapop or desktop...this did the trick for me. Good luck!