Microsoft Entra B2B collaboration code and PowerShell samples

POST https://graph.microsoft.com/v1.0/invitations
Content-type: application/json
{
  "invitedUserEmailAddress": "david@fabrikam.com",
  "invitedUserDisplayName": "David",
  "inviteRedirectUrl": "https://myapp.contoso.com",
  "sendInvitationMessage": true
}

using System;
using System.Threading.Tasks;
using Microsoft.Graph;
using Azure.Identity;

namespace SampleInviteApp
{
    class Program
    {
        /// <summary>
        /// This is the tenant ID of the tenant you want to invite users to.
        /// </summary>
        private static readonly string TenantID = "";

        /// <summary>
        /// This is the application id of the application that is registered in the above tenant.
        /// </summary>
        private static readonly string TestAppClientId = "";

        /// <summary>
        /// Client secret of the application.
        /// </summary>
        private static readonly string TestAppClientSecret = @"";

        /// <summary>
        /// This is the email address of the user you want to invite.
        /// </summary>
        private static readonly string InvitedUserEmailAddress = @"";

        /// <summary>
        /// This is the display name of the user you want to invite.
        /// </summary>
        private static readonly string InvitedUserDisplayName = @"";

        /// <summary>
        /// Main method.
        /// </summary>
        /// <param name="args">Optional arguments</param>
        static async Task Main(string[] args)
        {
            string InviteRedeemUrl = await SendInvitation();
        }

        /// <summary>
        /// Send the guest user invite request.
        /// </summary>
        private static async string SendInvitation()
        {
            /// Get the access token for our application to talk to Microsoft Graph.
            var scopes = new[] { "https://graph.microsoft.com/.default" };
            var clientSecretCredential = new ClientSecretCredential(TenantID, TestAppClientId, TestAppClientSecret);
            var graphClient = new GraphServiceClient(clientSecretCredential, scopes);

            // Create the invitation object.
            var invitation = new Invitation
            {
                InvitedUserEmailAddress = InvitedUserEmailAddress,
                InvitedUserDisplayName = InvitedUserDisplayName,
                InviteRedirectUrl = "https://www.microsoft.com",
                SendInvitationMessage = true
            };

            // Send the invitation 
            var GraphResponse = await graphClient.Invitations
                .Request()
                .AddAsync(invitation);

            // Return the invite redeem URL
            return GraphResponse.InviteRedeemUrl;
        }
    }
}

Install the following npm packages:

npm install express
npm install isomorphic-fetch
npm install @azure/identity
npm install @microsoft/microsoft-graph-client

const express = require('express')
const app = express()

const { Client } = require("@microsoft/microsoft-graph-client");
const { TokenCredentialAuthenticationProvider } = require("@microsoft/microsoft-graph-client/authProviders/azureTokenCredentials");
const { ClientSecretCredential } = require("@azure/identity");
require("isomorphic-fetch");

// This is the application id of the application that is registered in the above tenant.
const CLIENT_ID = ""

// Client secret of the application.
const CLIENT_SECRET = ""

// This is the tenant ID of the tenant you want to invite users to. For example fabrikam.onmicrosoft.com
const TENANT_ID = ""

async function sendInvite() {

  // Initialize a confidential client application. For more info, visit: https://github.com/Azure/azure-sdk-for-js/blob/main/sdk/identity/identity/samples/AzureIdentityExamples.md#authenticating-a-service-principal-with-a-client-secret
  const credential = new ClientSecretCredential(TENANT_ID, CLIENT_ID, CLIENT_SECRET);

  // Initialize the Microsoft Graph authentication provider. For more info, visit: https://video2.skills-academy.com/graph/sdks/choose-authentication-providers?tabs=Javascript#using--for-server-side-applications
  const authProvider = new TokenCredentialAuthenticationProvider(credential, { scopes: ['https://graph.microsoft.com/.default'] });

  // Create MS Graph client instance. For more info, visit: https://github.com/microsoftgraph/msgraph-sdk-javascript/blob/dev/docs/CreatingClientInstance.md
  const client = Client.initWithMiddleware({
    debugLogging: true,
    authProvider,
  });

  // Create invitation object
  const invitation = {
    invitedUserEmailAddress: 'david@fabrikam.com',
    invitedUserDisplayName: 'David',
    inviteRedirectUrl: 'https://www.microsoft.com',
    sendInvitationMessage: true
  };
  
  // Execute the MS Graph command. For more information, visit: https://video2.skills-academy.com/graph/api/invitation-post
  graphResponse = await client.api('/invitations')
    .post(invitation);
  
  // Return the invite redeem URL
  return graphResponse.inviteRedeemUrl
}

const inviteRedeemUrl = await sendInvite();