Did you adjust the capabilities in the “Package.appxmanifest” file? Here is how to access the Capabilities I’m referring to…
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Build UWP Player via Unity
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Open generated .sln file in Visual Studio
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Open file “Package.appxmanifest”
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Switch to “Capabilities” tab in “Package.appxmanifest”
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Enable whatever Capabilities you need, e.g.: Internet (Client & Server), Internet (Client), Point of Service, Private Networks (Client & Server), Remove System, etc
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Press in Mainmenu > Build > Build Solution
If you post source code, I recommend to use code-tags, makes it easier for people to read: