When Single Sign-on is enabled you can use the "Sign with Microsoft" button on the eHour login page to sign in with your Microsoft account. You can also go directly to
Yes, you still have to create a user in eHour with the same email address as the address in Microsoft Azure Active Directory / Office 365. You assign projects and tasks to the user in eHour, the Microsoft account is only used for authentication.
How can I sign in with my Microsoft account?