as @mlefebvre correctly suggested: https://developer.cisco.com/meraki/webhooks/custom-payload-templates-overview/#dig The alertData property is ... special. Since every alert contains different properties, its sort of a black box to the template language. So, using the "dig" filter runs a function to pull this info out at runtime. That being said, if the nested property is declared, then using the dot.notation works. We can update the documentation to make this more clear.
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