If you go to your Azure portal and navigate to Azure Active Directory, you should see something like that shown above. If you then scroll down the options on the left and locate Usage & insights , under Monitoring as shown above, you’ll end up here.
Selecting Authentication method activity on the left gives you some information about things like MFA, Self Service Password reset and more. You can also select the Usage tab at the top of the window on the right, will give you some nice historical graphs well.
An easy way to see how and when people are completing security registrations for Azure AD.