Signtool error: No certificates were found that met all given criteria with a Windows Store App?

Question

I\'m trying to sign a Windows 8 appx package with a pfx file I have. I\'m using a command like so:

signtool.exe sign /fd sha256 /f \"key.pfx\" \"app.appx\"
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Answer 1

I had a similar problem my computer name had change and the certificate had expired. I was able to resolve this issue by creating a new test certificate.

In Visual Studio, right click on project in solution explorer. Select properties. Select Signing in properties window. Click "Create Test Certificate....". Enter password information for test certificate and click ok.