How to Disable Security Default in Microsoft 365 Exchange Online

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Security Defaults are a set of policies that are enabled by default for Microsoft 365 accounts to provide increased account and organizational security. These settings include using Multi-Factor Authentication (MFA) for logins, disabling legacy mail protocols (IMAP, POP3, and SMTP), etc. In some cases, the Microsoft 365 administrator needs to turn off the Security Defaults settings in Microsoft 365 tenants: