Spending 2 days trying to figure out why code signing wasn’t working when deployment is started from teamcity. Every time I tried manually it worked, but through teamcity it just kept telling me that no certificate could be found.

I finally twigged what the problem was, my code signing certificate is smart card based and you can’t access it if is requested from a RDP session. I had launched the teamcity build agent from an RDP session a few days back without thinking…

Rebooted and started the buildagent via VirtIO VNC and low and behold it started working again.