Turn Security defaults on or off in M 365

 https://docs.microsoft.com/en-us/microsoft-365/admin/security-and-compliance/set-up-multi-factor-authentication?view=o365-worldwide

If your subscription is new, Security defaults might already be turned on for you automatically.

You enable or disable security defaults from the Properties pane for Azure Active Directory (Azure AD) in the Azure portal.

1. Sign in to the Microsoft 365 admin center with global admin credentials.
2. In the left nav choose Show All and under Admin centers, choose Azure Active Directory.
3. In the Azure Active Directory admin center choose Azure Active Directory > Properties.
4. At the bottom of the page, choose Manage Security defaults.
5. Choose Yes to enable security defaults or No to disable security defaults, and then choose Save.