PlatformZoe
Promote an incident to a major incident from Zoe
Asking Zoe to promote or demote a major incident now goes through ServiceNow's own major-incident process, so the change actually applies instead of quietly failing, and she says plainly when your instance refuses the transition.
This needs version 1.3.0 or later of the AINOW application installed in your ServiceNow instance, and the requesting account must hold the major-incident role. On an older version Zoe tells you what to install rather than reporting a change that did not happen.
When ServiceNow's own rules refuse the transition — the incident is already resolved, say, or its priority does not qualify — she reports that reason back to you.