Tutorial: Use PowerShell to bulk invite Microsoft Entra B2B collaboration users

If you use Microsoft Entra B2B collaboration to work with external partners, you can invite multiple guest users to your organization at the same time via the portal or via PowerShell. In this tutorial, you learn how to use PowerShell to send bulk invitations to external users. Specifically, you do the following:

  • Prepare a comma-separated value (.csv) file with the user information
  • Run a PowerShell script to send invitations
  • Verify the users were added to the directory

If you don't have an Azure subscription, create a free account before you begin.


Install the latest Microsoft Graph PowerShell module

Make sure that you install the latest version of the Microsoft Graph PowerShell module.

First, check which modules you've installed. Open PowerShell as an elevated user (Run as administrator), and run the following command:

Get-InstalledModule Microsoft.Graph

To install the v1 module of the SDK in PowerShell Core or Windows PowerShell, run the following command:

Install-Module Microsoft.Graph -Scope CurrentUser

Optionally, you can change the scope of the installation using the -Scope parameter. This requires admin permissions.

Install-Module Microsoft.Graph -Scope AllUsers

To install the beta module, run the following command.

Install-Module Microsoft.Graph.Beta

You may receive a prompt that you're installing the module from an untrusted repository. This occurs if you haven't previously set the PSGallery repository as a trusted repository. Press Y to install the module.

Get test email accounts

You need two or more test email accounts that you can send the invitations to. The accounts must be from outside your organization. You can use any type of account, including social accounts such as gmail.com or outlook.com addresses.

Prepare the CSV file

In Microsoft Excel, create a CSV file with the list of invitee user names and email addresses. Make sure to include the Name and InvitedUserEmailAddress column headings.

For example, create a worksheet in the following format:

Screenshot that shows the csv file columns of Name and InvitedUserEmailAddress.

Save the file as C:\BulkInvite\Invitations.csv.

If you don't have Excel, you can create a CSV file in any text editor, such as Notepad. Separate each value with a comma, and each row with a new line.

Sign in to your tenant

Run the following command to connect to the tenant:

Connect-MgGraph -TenantId "<YOUR_TENANT_ID>"

For example, Connect-MgGraph -TenantId "11111111-aaaa-2222-bbbb-33333333". You can also use the tenant domain, but the parameter remains the -TenantId. For example, Connect-MgGraph -TenantId "contoso.onmicrosoft.com".

When prompted, enter your credentials.

Send bulk invitations

To send the invitations, run the following PowerShell script (where c:\bulkinvite\invitations.csv is the path of the CSV file):

$invitations = import-csv c:\bulkinvite\invitations.csv

$messageInfo = New-Object Microsoft.Open.MSGraph.Model.InvitedUserMessageInfo

$messageInfo.customizedMessageBody = "Hello. You are invited to the Contoso organization."

foreach ($email in $invitations)
   {New-MgInvitation `
      -InvitedUserEmailAddress $email.InvitedUserEmailAddress `
      -InvitedUserDisplayName $email.Name `
      -InviteRedirectUrl https://myapps.microsoft.com `
      -InvitedUserMessageInfo $messageInfo `
      -SendInvitationMessage $true

The script sends an invitation to the email addresses in the Invitations.csv file. You should see output similar to the following for each user:

Screenshot that shows PowerShell output that includes pending user acceptance.

Verify users exist in the directory

To verify that the invited users were added to Microsoft Entra ID, run the following command:

 Get-MgUser -Filter "UserType eq 'Guest'"

You should see the users that you invited listed, with a user principal name (UPN) in the format emailaddress#EXT#@domain. For example, msullivan_fabrikam.com#EXT#@contoso.onmicrosoft.com, where contoso.onmicrosoft.com is the organization from which you sent the invitations.

Clean up resources

When no longer needed, you can delete the test user accounts in the directory. Run the following command to delete a user account:

 Remove-MgUser -UserId "<String>"

For example: Remove-MgUser -UserId "11111111-aaaa-2222-bbbb-33333333"

Next steps

In this tutorial, you sent bulk invitations to guest users outside of your organization. Next, learn how to bulk invite guest users on the portal and how to enforce MFA for them.