Cross Org id’s chat enablement

Hi amarnathreddy05,

To enable cross-organization chat in Microsoft Teams, you need to:

1. Enable external access in your Teams tenant.
2. Add the other organization's domain to your external access whitelist.
3. Have the other organization enable external access in their Teams tenant.
4. Add the other organization's domain to their external access whitelist.

Once you have completed these steps, users in your organization will be able to chat with users in the other organization.

To collaborate with external participants in a shared channel, you need to configure B2B direct connect for each organization that you want to collaborate with.

To do this, you need to:

1. Add the other organization to Microsoft Entra ID.
2. Configure inbound settings for the other organization to allow users from that organization to be invited to your shared channels.
3. Configure outbound settings for the other organization to allow your users to be invited to that organization's shared channels.

Once you have completed these steps, team owners in your organization will be able to invite people from other organizations to participate in shared channels.

Here is a more detailed explanation of each step:

Enable external access in your Teams tenant

1. Go to the Microsoft Teams admin center.
2. Click Organization-wide settings > External access.
3. Under External access, select Allow users to communicate with users outside of [your organization's domain].
4. Under Domains, add the other organization's domain to the whitelist.
5. Click Save.

Add the other organization's domain to your external access whitelist

1. Go to the Microsoft Teams admin center.
2. Click Organization-wide settings > External access.
3. Under Domains, click Add.
4. Enter the other organization's domain and click Add.
5. Click Save.

Have the other organization enable external access in their Teams tenant

The other organization needs to follow the same steps as above to enable external access in their Teams tenant.

Add the other organization's domain to their external access whitelist

The other organization needs to add your organization's domain to their external access whitelist.

Configure B2B direct connect for each organization that you want to collaborate with

1. Sign in to Microsoft Entra ID using a Global administrator or Security administrator account.
2. Select External Identities, and then select Cross-tenant access settings.
3. Select Organizational settings.
4. Select Add organization.
5. On the Add organization pane, type the full domain name (or tenant ID) for the organization and press Enter.
6. Select Add.
7. Follow the steps on the screen to configure inbound and outbound settings for the organization.

Once you have completed these steps, team owners in your organization will be able to invite people from other organizations to participate in shared channels.

Collaborate with external participants in a shared channel (IT Admins) | Microsoft Learn