Slack Grouped DM Error - "Does not conform to the email format. users_not_found" When Sending to Multiple Users

Q&A
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1

Hi Quick Community,

I’m building a custom chat agent that needs to send Slack messages to multiple users simultaneously using Grouped DM functionality. However, I’m encountering an error when attempting to pass multiple user identifiers.

Error Message: “Does not conform to the email format. users_not_found”

error
error874×724 30.9 KB

What I’m Trying to Do:

  • Send a Slack message to multiple users (typically 2-3 people)

  • Use Grouped DM to create a conversation with all recipients

Current Approach:

  • I’m passing multiple identifiers separated by commas, but the system rejects them with the above error.
  • I’m checking the users are active on slack
  • Tried using their Member ID instead of email.
  • Tried using semicolon instead of commas.
2

Hi @tejshreb and welcome to the Quick Community!
Have you tested out by sending to one of the Emails at a time to confirm that it’s the format of adding multiple users that’s providing an issue?
If not, I would suggest sending individually to each of the 3 users first to confirm if the issue is linked to grouping the 3 names, one user/email in particular or the overall action.

3

Hi @Brett,

Thank you for the prompt response. I did try by sending just one email and that worked pretty well.

As per the error , its seems like the formatting issue.

4

Hi @tejshreb,
Thank you for the additional notes; I wonder if this is a current limitation the system has in relation to sending Emails. Unfortunately, there’s no official documentation that details how to properly format if there are multiple Email addresses. I will mark this as a feature request to promote visibility to the support team. Additionally, if I am able to get in contact with the proper team, I’ll try to figure out if this is actually a current limitation or a formatting issue!