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With Slack Connect, you can invite people outside your company to join a channel in your workspace — perfect for using Slack to communicate with clients or vendors, for example. To get started, you’ll need to send an invitation to someone from each company you’d like to work with. People will only have access to channels in your workspace they’ve been invited to join.
What to expect
You can work with up to 19 other companies in a single channel. Someone from each company will have to accept the invitation before you can start working together. Each company you invite must be using one of Slack's paid plans.
Invitations expire after 14 days. If this happens, you can send a new one.
Admins can restrict who can invite people from other companies to channels. If you don’t see this option, find an owner or admin and ask for help.
Note: If your team would benefit from working with more than 19 other organizations, reach out to us — we’d love to learn more!
Add external people to a channel
You can create a new channel, or invite external people to any existing channel (except for the #general channel). When people join an existing channel, they’ll be able to see the message history, member list, and any apps or bots.