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With External Access for Teams, you can add or invite anyone outside of your Teams org who uses Teams, Teams for personal use, Skype (for consumers), and Skype for Business to a one-to-one chat. 

You can also ask your admin to add external users to your organization’s extended directory using their phone number. Once added, you'll be able to search for them as you search for anyone inside your organization.

For those who use Teams or Teams for personal use, this includes both one-to-one chats and new or existing group chats.

First things to know

  • If you invite someone who doesn’t have a Teams account, they’ll receive an invite to start an unmanaged Teams account and then join the chat with all chat history included.

  • People from different Teams orgs can be easily added to each other's chats without sending invites.

  • Admins can add known external contacts to your organization’s extended directory. Once added, these contacts can be searched using their name or phone number. To learn more, see Manage external meetings and chat.

  • People who use Teams for personal use must accept a chat invite to participate in a chat. When a chat is created between a managed Teams org and a Teams for personal use account, only certain options are available.

  • External Access is turned on by default, but it can be turned off or restricted by an org’s admin, such as blocking certain addresses or domains.

  • An external label at the top of a chat indicates if there are any external participants in the chat. You'll also see an identifying label beside the names of any external participants in one-to-one and group chat participant lists. On the upper-left side of Teams

  • A person's status indicator is always shown for people who use Teams and Skype for Business, only shown for people who use Teams for personal use after they accept a chat invite, and not shown for people who use Skype.

Add or invite someone from outside your org to a one-on-one chat

People you add or invite outside of your org to a one-to-one chat may include anyone who uses Teams, Teams for personal use, Skype, and Skype for Business.


  • Anyone who uses Skype or Teams for personal use can accept or block chat invites. You can block any incoming communication from them as well.

  • You can use a phone number to search for someone who uses Teams for personal use.

  • Skype and Skype for Business participants can only use plain text in a chat.

  1. On the left side of Teams, select Chat  Blue chat icon and then New chat Teams new chat icon to start a new chat.

    Invite someone outside of Teams

  2. Type the person’s email addressor phone number that you want to invite to chat. 

    If their name appears, select it from below the command bar. If there isn’t a name match, select Search [email address] externally to send them a chat invite. 

    No external match

  3. To start the chat, type a message in the text box at the bottom and then select Send Send icon.

    Tip: To format the message before you send it, choose one of the formatting options at the bottom of the chat before sending.

Add someone who uses Teams outside of your org to a group chat

People you add who are outside of your org to a new or existing group chat must use Teams or Teams for personal use. 

Note: Chat participants from different orgs that restrict or block communication with each other may be part of your group chat if your org is allowed to communicate with those orgs.

Start a new group chat and add participants

  1. Type the email addressesor phone numbers of the people you want to invite to chat. 

  2. Type a message in the text box at the bottom or click the down arrow on the right to add a group name (optional) before typing a message.

Add group name

Note: A group chat is limited to 250 people, although each person may be from a different Teams org.

Add participants to an existing group chat

You may only add external access participants to existing or ongoing chats that already include at least one external access participant. Otherwise, you’ll create a new group chat with the internal participants and the one or more external participants that you’re adding.

  1. Choose or be active in the existing group chat that you need to add the participants to.

  2. Select View and add participants Add participants icon below your profile picture at the upper-right of Teams, and then choose Add people Add participants icon.

  3. Select the added participant's name, then choose if and how much of the chat history you'd like to include. Select Add. 

    Chat history

    You’ll then see those people added to the group chat.

    If there isn’t an immediate name match for a person (no results found), choose Search [email address of person] externally to send them a chat invite.

  4. To start or continue the chat, type a message in the text box at the bottom and then select Send Teams chat send button icon.

    Tip: If you'd like to format the message before you send it (optional), choose one of the formatting options at the bottom of the chat before sending.

More things to know

  • External chat participants who use Teams and Teams for personal use may edit and delete sent messages, set delivery options, format text, use emoji, stickers, and GIFs in conversations, use @mentions, and show their status in a chat. However, they can’t share or attach files or use tabs or apps.

  • In most cases, all chat participants can view each other’s profiles.

  • Some outside orgs or external access capabilities may be blocked by your org, or your org may be blocked by them.

  • You can host an external group chat with up to 249 other orgs.

  • An external chat remains external even if all external participants are no longer part of the chat.

  • When you join an external group chat within an org, you're subject to the policies of that org. Also, the shortest retention policy applies, which are settings that determine how long a chat or message is kept.

  • An external chat becomes read-only if all participants in the org where the chat was created are removed from that org.

  • Data-loss prevention (DLP) and information barriers don't apply to External Access chats.

For more info about External Access and related settings, see Manage external access in Microsoft Teams or check with your admin.

Start a chat with an external contact added to your organization's extended directory

If your org's admins have enabled the Teams Connect Extended Directory for chat, you can find these external contacts by searching for them using their name or phone number.

  1. Go to Chat > New Chat  New chat conversation icon.

  2. In the To: field, enter the person's name or phone number, then select them from the search results.

  3. Select the correct contact and send your first message to start the chat. 

The external contact can see your organization's privacy policies when they are making the decision to accept or block the invite. 

To learn more, see Accept, block, or delete chat or meeting requests from people outside your organization.

To view profile information for an external user added to your organization’s extended directory, go to their profile card. These details are available when provided by your organization's admins.

How an external TFL user's profile card appears to a TFW user.

Related links

First things to know about group chats
Leave or remove someone from a group chat
Chat in a Teams meeting
Advanced: native chat experience for external (federated) users in Microsoft Teams


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