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Installing Slack Relay in Microsoft Teams

  1. In Teams, open Apps, search for Slack Relay and choose Add. The app opens on its Connections page.
  2. Choose Add Slack Relay to a team. Teams opens the app's page; use the arrow next to Add and pick Add to a team. Teams then asks for the team and a channel, and shows the permissions Slack Relay needs. These permissions apply to that team only.
  3. A Slack Relay tab appears in the channel you chose. Open it and choose Connect this channel to Slack.
  4. Copy the link and send it to your contact in the Slack workspace. They add Slack Relay to Slack and pick the Slack channel. Both channels get a message when relaying starts.

Waiting on your admin?

Some organizations ask an administrator to approve new Teams apps. If the Store shows Request approval instead of Add, send the request. Your Teams administrator sees it in the Teams admin center under Manage apps, with your name next to it. Once they approve and allow the app, Teams notifies you and you can add it as above. If nothing arrives, ask your administrator to check Teams apps → Manage apps → Slack Relay.

For administrators: Slack Relay uses resource-specific permissions granted per team at install time (read channel messages and settings, read team members, manage its own tab, send activity notifications). It needs no tenant-wide Graph permissions and no admin consent in Entra. You can allow it for everyone, install it for selected users, or pin it from an app setup policy.

On the Slack side

Open the link your contact sent you, choose Add to Slack, then pick the channel. Public channels are joined automatically. For a private channel, run /invite @Slack Relay in that channel first. The same link lets you view the connection and delete it later.

What is relayed and stored

Messages, threaded replies and emoji reactions posted by people in a connected channel are relayed to the other channel with the sender's name and avatar. Message content passes through our servers in memory and is not stored. We keep the identifiers needed to match replies and reactions across the two channels, the Slack bot token for your workspace, and the names and email addresses of the people who set up each connection, so we can tell them when a connection stops. Deleting a connection removes its identifiers. See the privacy policy.

Stopping a connection

Delete it from the Slack Relay tab in Teams, from the web after signing in with Microsoft, or from the Slack-side link. Removing the app from the Teams team or uninstalling it from Slack also stops every connection it was part of. The other side is told in its channel and the contacts are emailed.

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