Symptoms
'Custom' tab or workflow palette missing in the instance workflow editor
Release
Any
Cause
1. Orchestration [com.snc.runbook_automation] plugin is not activated.
2. Check if there are recent clone done between the instances where the Orchestration plugin is not active in the Source instance.
Resolution
Request plugin Orchestration [com.snc.runbook_automation] activation via HI.
Additional Information
Check on the docs.service-now.com topic 'Activate Orchestration' on how to activate the plugin.