To invite a pre-existing external user:
- In the right sidebar of the relevant Channel, click Settings
- Search for the user in the Channel Settings pop-up search bar
- Click Update Members
- Confirm that you wish to start an External Channel with someone outside your organization
To invite a new external user:
- In the right sidebar of the relevant Channel, click Settings
- Click on the Invites tab
- Enter the external user’s email address and name
- Click Send Invite
- Confirm that you wish to start an External Channel with someone outside your organization