In Service Desk Automation, you are restricted to only the options that are presented. Since "updated" isn't among the list you will have to be more creative. You can choose a comment added, or a status change which is about as close as you will get to the update.
What is your use case?
Hello Atlassian Community! I'm Teresa, the Product Marketing Manager for Jira Service Desk Server at Atlassian. Curious about the latest updates in the Jira Service Desk Server...
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