Currently when an idea is promoted to any kind of product planning entity (like an initiative or epic/feature) we cannot use promotion as a trigger for any actions in an automation. This needs to be combined with a status update or any existing trigger that is available for an automation.
We need to rely on an existing trigger to be able to run automations on promoted ideas
Make promotion of the idea itself a trigger, to for example change the status, create a to-do, notify some specific users etc.