You can change the debug log level in appsettings.json but that won’t help in this instance as there is no additional debug level logging for this feature.
Behind the scenes we’re using https://github.com/mj1856/SimpleImpersonation so I wonder if the logon type is incorrect or if there is an async issue.
Could you try this test version of the deployment tasks dll?
https://certifytheweb.s3.us-east-1.amazonaws.com/downloads/test/Plugin.DeploymentTasks.Core.zip
You’d just need to backup your copy of C:\Program Files\CertifyTheWeb\Plugins\Plugin.DeploymentTasks.Core.dll then copy this dll over the top of the existing one, restart the Certify background service and re-launch the UI.