Unable to enroll any device when using Certificate based authentication

Enrollments are failing for all platforms. During the enrollment process,the server logs are showing a failure to sign the CSR, followed by a wipe triggered on the device: 2017-09-10T10:11:12.45+0100 | 32A9CFAD5515A088 | ERROR | http-nio-10443-exec-3 | com.sparus.nps.ios.agent.V10AgentHandler |...