It's weird that the URL of JIRA REST API looks good,
com.atlassian.crowd.exception.InvalidCrowdServiceException: The following URL does not specify a valid Crowd User Management REST service: https://myjira.net/rest/usermanagement/1/group/user/direct?groupname=systems&username=dev at com.atlassian.crowd.integration.rest.service.RestExecutor$MethodExecutor.executeCrowdServiceMethod(RestExecutor.java:455)
Can you please run this command snip on your jenkins master instance and post the result? It will be much helpful.
curl -D- -u application:password -X GET "https://myjira.net/rest/usermanagement/1/group/user/direct?groupname=systems&username=dev"
Please note change application and password, and mask out sensitive information in the result, e.g. cookies, ASEN
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