try removing platform/config
<?xml version="1.0" encoding="utf-8" ?>
<!-- This file is used by the build system to do a post-build code sign operation -->
<SignConfigXML>
- <!-- AnyCPU Release sign job -->
- <job platform="AnyCPU" configuration="Release" dest="__OUTPATHROOT__" jobname="IOT Samples" approvers="artemz;torstens">
+ <!-- Sign job -->
+ <job platform="" configuration="" dest="__OUTPATHROOT__" jobname="IOT Samples" approvers="artemz;torstens">
<file src="__INPATHROOT__\WindowsIoTCoreTemplatesDev15.vsix" signType="100040160" dest="__OUTPATHROOT__\WindowsIoTCoreTemplatesDev15.vsix" />
</job>
</SignConfigXML>
