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Shared channels in Microsoft Teams create collaboration spaces where you can invite people who aren't in the team. Microsoft Purview Information Barriers are policies you implement to restrict and prevent users and groups from communicating with each other within and outside of your organization.
Shared channels are enabled by default in Teams. You can decide if people can create shared channels, share them with people outside your organization, and participate in external shared channels by creating a channel policy. When you create Information Barriers policies in your organization, checks are performed when configuring shared channels to verify that none of the existing channel members and any new users added to the shared channel violate Information Barriers policy conditions.
Use the following table to understand how Information Barriers policies affect communications and result in specific behaviors when configuring shared channels:
| Scenario | Information Barriers behavior |
|---|---|
| Share a channel with a user in your organization | If an Information Barriers policy prevents the user from communicating with shared channel members, the user doesn't appear in the user search and the channel isn't shared with the team. If an Information Barriers policy prevents adding the user, you see the following message: We didn't find any matches. Talk to your IT admin about expanding the scope of your search. |
| Share a channel in your organization with another team that you own | If an Information Barriers policy prevents users in the other team from communicating with shared channel members, the channel isn't shared with the team. If an Information Barriers policy prevents communications, you see the following message: The channel can't be shared with this team. Pick another team or contact your admin for more info. |
| Share a channel in your organization with another team that you don't own | If an Information Barriers policy prevents the team owner or any users of the other team from communicating with shared channel members, the channel can't be shared with the team. If an Information Barriers policy prevents communications, you see the following message: The channel can't be shared with this team. Pick another team or contact your admin for more info. |
| Add a new user to the team when the team has shared channels with other teams | If an Information Barriers policy prevents the new user from communicating with members of the shared channel team, the user can't be added to the team. When you add a user to a team with six or more shared channels, you immediately add the user to the channel and support sharing. Sharing for the team and the previously shared channels stops if an Information Barriers policy finds the new user to be non-compliant. If an Information Barriers policy prevents adding the user, you see the following message: Unable to add user due to an Information Barriers policy. |
| Share a channel with an external team | Information Barriers policies on internal and external organizations don't restrict communications between users from the different organizations. Shared channels are available to be shared with external guests. |