You can enable automatic user provisioning for your multi-tenant application in Azure Active Directory.
Automatic user provisioning is the process of automating the creation, maintenance, and removal of user identities in target systems like your software-as-a- service applications.
Azure AD provides several integration paths to enable automatic user provisioning for your application.
* The Azure AD Provisioning Service manages the provisioning and deprovisioning of users from Azure AD to your application (outbound provisioning) and from your application to Azure AD (inbound provisioning). The service connects to the System for Cross-Domain Identity Management (SCIM) user management API endpoints provided by your application.
* Microsoft Graph
* The Security Assertion Markup Language Just in Time (SAML JIT) user provisioning.
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/app-provisioning/isv-automatic-provisioning-multi-tenant-apps
