Release : 18.1
Component : Endevor Software Change Manager
There is a known defect with TLSv3 in Endevor Web Services when multiple requests for the same user hit the server at more or less the same time.
Update Endevor web services server.xml SSL configuration, disable TLSv1.3.
Recycle Tomcat after the change, then rerun Endevor Zowe CLI sync command.