How to Disable or Enable Two-Factor Authentication in Microsoft 365 | Disable Multi-Factor Auth 

You are welcome. To find the 'Manage Security Defaults,' open the 'Microsoft Entra admin center,' under 'Identity' select 'Overview.' Then, under the 'Properties' tab, you will see it at the bottom of the window.

Hi, Are you logged in as an admin? If logged in as a non-admin account, you can set up the two-factor here: aka.ms/mfasetup

With an admin account you access the multi-factor authentication page here: account.activedirectory.windowsazure.com/UserManagement/MultifactorVerification.aspx