Invited External User to Slack as Full Member, Cannot Revert to Guest


U-M Slack


I invited someone external to my U-M Slack workspace as a Full Member. Because external users cannot be Full Members in U-M Slack, I need to change them to a Single-Channel Guest, but Slack is not allowing me to re-invite them.


When an external user is invited as a Full Member, the only way to re-invite them as a Single-Channel Guest is to deactivate and reactivate their Slack account. This part of the process can only be accomplished by ITS. Below are steps Workspace Admins should complete before and after ITS intervention on the external user's account.

Before Request 

  1. Before ITS moves forward with your request, remove the external user(s) from your workspace
    1. Click your U-M Slack workspace's name from the upper-left corner of your Slack desktop app
    2. Hover over Settings & administration in the drop-down menu, and select Manage members
    3. Enter the member's name in the Search current members field
    4. Click the three-dots icon to the right of the member you’d like to remove
    5. Select Remove from workspace from the drop-down menu
  2. After you have removed the external user from your workspace, ITS can now complete the deactivation/reactivation of the account
    1. If you have not already, make sure you have a ticket open with ITS by contacting the ITS Service Center.

After Deactivation and Reactivation

  1. After ITS deactivates and reactivates the external user(s), re-invite them as a Single-Channel Guest
    1. Click your U-M Slack workspace's name from the upper-left corner of your Slack desktop app
    2. Select Invite people to [WORKSPACE NAME] from the drop-down menu
    3. Enter the external user's email address in the To: field
    4. Select Guest from the Invite as drop-down menu
    5. Enter the channel name to which they will be added in the Add to Channels field
    6. Click Send Request

Additional Information

Need additional information or assistance? Contact the ITS Service Center.


Article ID: 8507
Mon 7/18/22 1:01 PM
Wed 8/10/22 11:50 AM

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This article explains how to add non-UMICH email addresses as guests to a U-M Slack channel.
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