Microsoft Graph Invitations

Microsoft Graph Invitations is a Microsoft Graph API feature that lets apps programmatically invite external (B2B) users into a Microsoft Entra ID tenant. By calling POST /invitations, it creates a guest user and can send an email invitation with a redemption link, or you can suppress the email and use the returned inviteRedeemUrl to deliver the link yourself. You can set the invited users email and display name, choose a post-acceptance redirect URL (often a deep link to your app), and customize the invitation message and recipients. When the invite is redeemed, the user is added as a guest (userType=Guest) and can be assigned to apps, groups, and resources per your policies. This enables automated, governed cross-tenant collaboration and streamlined external user onboarding.