Forum Discussion
License for MFA
I've done a few F5 integrations
F5 APM -> Azure AD SAML integration
F5 APM -> NPS Azure MFA extension
F5 APM -> ADFS / Azure MFA
https://docs.microsoft.com/en-us/azure/active-directory/authentication/concept-mfa-licensing#feature-comparison-of-versions
If you have Office 365 E3/E5 or Microsoft 365 E3/E5 that's enough.
If you have Office 365 Business Premium and plan to add-on P1, I would recommend at least a the new Microsoft 365 Business Premium plan(renamed April 21, 2020) that will include Azure AD Premium P1 add-on soon. You get Intune device management license as well with M365.
MFA doesn't require a license unless you want to use other authentication methods other than app, such as text message or phone call.
But you will want P1 licenses to utilize Conditional Access policy for MFA vs per user MFA setting.