Explanation
Scenario: Ensure that employees can sign in to all Microsoft apps by using one set of credentials per employee.
Synchronized identity. Synchronize on-premises directory objects with Microsoft 365 and manage your users on-premises. You can also synchronize passwords so that the users have the same password on-premises and in the cloud, but they will have to sign in again to use Microsoft 365.
Reference:
https://docs.microsoft.com/en-us/power-platform/admin/manage-user-account-synchronization