Symptom: When replacing my VMWare certificates with signed certificates, I was receiving the following error when running the Invoke Certificates command:
Method Invocation Result: vpx.fault.SecurityConfigFault
Solution: Unfortunately, the only way I could figure out how to fix this issue was to reboot the vCenter server and try again. The error went away upon reboot.
Very helpful, thank you. I considered this solution very unlikely, when I ran into this problem, but it did the trick.