Unable to promote/accept certain incidents as Major Incidents.
Release or Environment
Line 112 to 113 in the Script Include:MajorIncidentTriggerRulesSNC was failing:
The Incident was a child incident. The Options(promote/accept Major Incident) will not be visible to Child Incidents.
After clearing the Parent incident value from the Child Incident you will be able to see the Options(promote/accept Major Incident).