Tenant administrators must enable the Exchange Online Self-Service feature for the users in their environment. Administrators must configure several entities, such as a company and a server plan. After administrators configure those entities, they must enable the Self Service feature by completing a few tasks, such as assigning the Office 365 Self Service role to the Microsoft 365 user group and turning on the feature at the Microsoft 365 plan level.
Important
To enable Exchange Online Self Service, the first endpoint must be Azure AD via a SAML app. This ensures users can authenticate through Azure and access their mailbox data securely.