Hi Hongkai
My name is Andre Da Costa; an Independent Consultant, Windows Insider MVP and Windows & Devices for IT MVP. I'm here to help you with your problem.
You should check if your Firewall might be affecting Skype.
Click Start, type allow an app
Hit Enter
Click Change settings
Click Allow another app...
Click Browse the look for the Duet display .exe
Click Add
Check the box under Private for it
Click ok
Best regards,
Andre Da Costa
Independent Advisor for Directly
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