After having introduced in preview the Usage and Insights for Azure AD Application (see https://t.co/0TLTScRjWI), you can now also have the same insights for the authentication methods used to authenticate against Azure AD.
To start using this ‘reporting’ feature, logon to your Azure AD (https://aad.portal.azure.com) or your Azure (https://portal.azure.com/) portal and reach out the Azure Active Directory\Monitoring\Usage & Insights blade
Then you can access Azure AD Application activity insights (see https://t.co/0TLTScRjWI) and the Authentication methods insights
You have reports on the number of users registered for MFA/registered for SSRP, registration failures by using the Registration tab
Switching to the Usage tab you will get report related to SSPR and unlock account methods
Off course, if you click on one of these reports, you will get more details
This is a good start, hopefully there will be more reports provided in a near future.