How to disable basic authentication in Microsoft Office 365

Basic authentication is enabled by default in all Office 365 implementations unless you disable it. Attackers will go after weaker credentials and passwords to gain network access. If you disable basic authentication, you might have to set up an iPhone Exchange mail profile after MFA is enabled. Some third-party applications that hook into Office 365 may still use basic authentication. For example, the native iPhone mail application still relies on basic authentication for. For more information, visit the CSO blog and CSO.com/CASMailbox.”]

Source: https://www.csoonline.com/article/3400873/how-to-disable-basic-authentication-in-microsoft-office-365.html