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

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” And from this, I get: SignTool Error: No certificates were found that met all the given criteria. What “criteria” am I not meeting? This is only for … Read more