Just like similar plugins, (e.g. GitHub and GitLab), the Build Token Root Plugin does not play nice whith CSRF protection enabled.
      The root cause seems to be JENKINS-22474 (documented by Jesse Glick), but until that is fixed, the Build Token Root Plugin should probably add a CrumbExclusion for the URL it is listening on.
      See JENKINS-20140 for a similar issue in the GitHub Plugin, that has been resolved.

          [JENKINS-25637] Add CrumbExclusion for buildByToken URL

            jglick Jesse Glick
            kflorian kflorian
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