When trying to associate an external Identity with HCMWorkers in some of our dev environments that were recently updated to platform 10.0.14 and the DB from UAT we are getting the generic "This service is unavailable" message. Upon debugging I found that the actual exception message is a CLIError:"Failed to get token by S2S certificate". This is only happening on our dev box's that were initially setup on 10.0.11 and not any that were initially setup on 10.0.12 (All deployed from LCS). Now that all dev Boxes have been updated to 10.0.14 and the most recent DB from UAT the issue only happens on the VM's that were originally 10.0.11.
Im guessing this is an issue with the needing to renew a certificate but am unsure what exactly needs to be done. Any help would be appreciated. 
Some additional info, the error appears during the function call to getGraphAPIClient(), which I am unable to track down due to it being non accesible.