Use server-to-server (S2S) AUTHENTICATION to securely and seamlessly communicate with Microsoft Dynamics 365 (online & on-premises) with your WEB APPLICATIONS and services. S2S authentication MEANS you don’t need to use a paid Dynamics 365 user license when you connect to Dynamics 365 tenants. There is no license fee for the special application user account you will use with S2S authentication. With S2S authentication a special Dynamics 365 unlicensed application user account is created and includes information about your application registered with Azure ACTIVE Directory (Azure AD). Rather than user credentials, the application is authenticated based on an application user identified by an Azure AD Object ID value which is stored in the Dynamics 365 user record. The Dynamics 365 application user is associated with a security role which controls the kinds of data and operations the application is allowed to perform.

Use server-to-server (S2S) authentication to securely and seamlessly communicate with Microsoft Dynamics 365 (online & on-premises) with your web applications and services. S2S authentication means you don’t need to use a paid Dynamics 365 user license when you connect to Dynamics 365 tenants. There is no license fee for the special application user account you will use with S2S authentication. With S2S authentication a special Dynamics 365 unlicensed application user account is created and includes information about your application registered with Azure Active Directory (Azure AD). Rather than user credentials, the application is authenticated based on an application user identified by an Azure AD Object ID value which is stored in the Dynamics 365 user record. The Dynamics 365 application user is associated with a security role which controls the kinds of data and operations the application is allowed to perform.