Solution
The Windows App Certification Kit is masking the publisher name from the package name, and causing the tests to fail.
Simply change the package name to NOT include the user name prior to running WACK.
Steps:
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Open your project in Visual Studio
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In the Solution Explorer, Right click on your
Package.appxmanifest file
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Choose View Designer
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Choose the Packaging tab
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Change the Package name such that it no longer includes the user name.
Note: This is only an issue when run locally. You may include your user name in the package name of your app when submitting to the store.