I'm trying to at mention a user in my JIRA Automation. I've read swathes of articles about how best to do this and it's not working. I'm using JIRA Server.
In my "Send Slack Message" content I've got the following (the bold is the response)
rep 1 - {{issue.fields.reporter}} - MARKHALLER
rep 2 - {{reporter}} - MARKHALLER
rep 3 - {{issue.fields.reporter.properties.slack}} - BLANK
rep 4 - {{issue.fields.reporter.legacyProperties.slack}} - BLANKI can see the following against my User profile in JIRA -

How do I get the slack property from the reporter user profile?