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

With /debug, when you get this message "After Private Key filter, 0 certs were left.", one reason could be that the pfx file doesn't have the private key. When you export the installed certificate to pfx file ensure to enable the check box to also include the private key.