Enable interoperability between Azure Communication Services and a Microsoft Teams tenant

Azure Communication Services can be used to build applications that enable Microsoft Teams external users to participate in calls and meetings with Microsoft Teams users. Standard Azure Communication Services pricing applies to these users, but there's no extra fee for the interoperability capability.

For calls with Teams users, ensure the user is Enterprise Voice enabled. To assign the license, use the Set-CsPhoneNumberAssignment cmdlet and set the EnterpriseVoiceEnabled parameter to $true. For additional information, see Set up Teams Phone in your organization.

Follow these steps to enable the connection between a Teams tenant and a Communication Services resource.

Enable interoperability in your Teams tenant

Microsoft Entra user with Teams administrator role can run PowerShell cmdlet with MicrosoftTeams module to enable the Communication Services resource in the tenant.

1. Prepare the Microsoft Teams module

First, open the PowerShell and validate the existence of the Teams module with the following command:

Get-module *teams* 

If you don't see the MicrosoftTeams module, install it first. To install the module, you need to run PowerShell as an administrator. Then run the following command:

	Install-Module -Name MicrosoftTeams

You'll be informed about the modules that will be installed, which you can confirm with a Y or A answer. If the module is installed but is outdated, you can run the following command to update the module:

	Update-Module MicrosoftTeams

2. Connect to Microsoft Teams module

When the module is installed and ready, you can connect to the MicrosftTeams module with the following command. You'll be prompted with an interactive window to log in. The user account that you're going to use needs to have Teams administrator permissions. Otherwise, you might get an access denied response in the next steps.

Connect-MicrosoftTeams

3. Enable tenant configuration

Interoperability with Communication Services resources is controlled via tenant configuration and assigned policy. Teams tenant has a single tenant configuration, and Teams users have assigned global policy or custom policy. For more information, see Assign Policies in Teams.

After successful login, you can run the cmdlet Set-CsTeamsAcsFederationConfiguration to enable Communication Services resource in your tenant. Replace the text IMMUTABLE_RESOURCE_ID with an immutable resource ID in your communication resource. You can find more details on how to get this information here.

$allowlist = @('IMMUTABLE_RESOURCE_ID')
Set-CsTeamsAcsFederationConfiguration -EnableAcsUsers $True -AllowedAcsResources $allowlist

4. Enable tenant policy

Each Teams user has assigned an External Access Policy that determines whether Communication Services users can call this Teams user. Use cmdlet Set-CsExternalAccessPolicy to ensure that the policy assigned to the Teams user has set EnableAcsFederationAccess to $true

Set-CsExternalAccessPolicy -Identity Global -EnableAcsFederationAccess $true