andyc-xmos

Could you maybe expand on that a bit? This is what the config map looks like: Name: jenkins-jenkins-config-markup-formatter Namespace: jenkins Labels: app.kubernetes.io/component=jenkins-controller app.kubernetes.io/instance=jenkins app.kubernetes.io/managed-by=Helm app.kubernetes.io/name=jenkins helm.sh/chart=jenkins-5.8.74 jenkins-jenkins-config=true Annotations: meta.helm.sh/release-name: jenkins...

I have tried copying it from jcasc config in the UI and typing it manually and I get the same result. Could you maybe share the contents of your file?

Thank you - using your snippet I get the same error. I think maybe our Jenkins version and plugins are not aligned?