Plugin load failed - digital signature missing

We are trying to implement cloud zoo licensing. I get this error ‘Plugin load failed - digital signature missing’ on GetLicense call in OnLoad of the plugin.

Followed all steps and signed the rhp file using signtool, which also indicates ‘successfully signed’. What might be the issue, can you please help?

Also please verify if the timestamp url mentioned in the documentation is correct and working. Thank you.

@will, @Trav - is this something you can help with?