We configure a github repo with a webhook to trigger a multibranch pipeline build on push (github-webhook/ (push)) and connect using the "branch sources" git integration and deploy keys with access to the repo. 

The push event is seen in the jenkins logs, but the multibranch pipeline job is not triggered. Nothing appears in the Multibranch Pipeline Events log. Only a manual rescan of the of the pipeline picks up changes to the repo, no matter which branch we push to (and "All branches get the same properties" is set).