Go to the Azure Portal https://portal.azure.com/#home and sign in with the admin account for your organisation. Click on the hamburger icon to expand the menu and select Azure Active Directory (renamed as Microsoft Entra ID).
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Select Properties from the left navigation menu.
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Click Manage security defaults, and toggle NO for Enable security defaults. Select your reason for disabling the security defaults, then click Save.
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MFA will now be turned off.