Tag the Custom Field Assignee in an automated Slack message

[Cagla Ozardali]

Hi, I'm trying to tag the Custom Field Assignee in an automated Slack message using:
@{{Project Lead.displayName.split(" ").first}}.

But the Slack message returns:
@firstName without tagging the person.

The reason I chose to call the first name is that in Slack first-name-only is a common use for names.

The problem is that even the e-mails in Slack and Jira match, I cannot tag the person in the automated message. Can you help with this please?

[Mikael Sandberg]

Hi @Cagla Ozardali,

Welcome to Atlassian Community!

This is expected, since Slack wants the display name in Slack, which by default is firstname.lastname. Your other option would be to import the member Id as an user entity and use that in your automation. Have a look at this article on how you can import the member Id from Slack.

[Kian Stack Mumo Systems]

@Cagla Ozardali, 

I would check out this article.

It looks like it is what you are trying to accomplish.