VSIX signing

Hi,

I signing my VSIX package using the VSIXSignTool as described here the command says the package was successfully signed but when try to install the VSIX package it says the extension contains an invalid digital signature.

I building my extension with Visual Studio 2012 on Windows 10 if that matters, I haven't see this kind of problems before when building my extension in Windows 8.1 with Visual Studio 2012.

I also get the same problem if try to sign the extension using the PackageDigitalSignatureManager in my custom sign task

Any ideas what can be going wrong here?