If I remember correctly, the alert created "normally" with a "create notable" action should work as well (although it will have less configuration options). But in order to be able to create notables the user who the alert is run with must have proper privileges within the ES app. So if an alert was created with a normal alert creation means instead of ES Content Management, the user might not be able to create notable due to insufficient permissions. (yes, I'm aware that it sounds a bit convoluted).
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