Install the Build Authorization Token Root Plugin on Jenkins
If anonymous access is disabled on Jenkins and if you want to trigger Jenkins jobs without an authenticated user’s credentials, install the Build Authorization Token Root plugin on Jenkins. You must be assigned the Jenkins Admin role to install the plugin. The plugin is required. To find out more about the plugin, see https://wiki.jenkins-ci.org/display/JENKINS/Build+Token+Root+Plugin.
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Log on to Jenkins using the administrator credentials.
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From the links on the left side of the page, click Manage Jenkins.

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Click Manage Plugins.
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In the Available tab, search for
Build Authorization Token Root, select its check box, and click Download now and install after restart or Install without restart.
Description of the illustration jenkins-build-authorization-token-root-plugn.png
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Wait for the plugin to install.
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Restart Jenkins.