I'm using an Automation rule to send out slack messages when the tickets are close to burst it's SLA and I want to mention the assignee from the ticket on the message.
Hi @Gabriel Freddi de Matos Santos,
Welcome to Atlassian Community!
In order to mention someone you need to know their username or ID in Slack. Have a look at this article describing how to get that added as properties so you can mention them, Mention someone directly in Slack via Jira Automation
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