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

In my case I have the wrong type of certificate that I am trying to associate.
I had "Server Authentication" rather than "Code signing".
You should be able to see this in Certificate snap in the Intended Purpose section.
After that, it just work fine.