-For federated domains, MFA may be enforced by Azure AD Conditional Access or by the on-premises federation provider. You can enable protection to prevent bypassing of Azure AD Multi-Factor Authentication by configuring the security setting **federatedIdpMfaBehavior**. Enable the protection for a federated domain in your Azure AD tenant. Make sure that Azure AD Multi-Factor Authentication is always performed when a federated user accesses an application that is governed by a Conditional Access policy that requires MFA. This includes performing Azure AD Multi-Factor Authentication even when federated identity provider has issued federated token claims that on-prem MFA has been performed. Enforcing Azure AD Multi-Factor Authentication every time assures that a bad actor can't bypass Azure AD Multi-Factor Authentication by imitating that identity provider already performed MFA and is highly recommended unless you perform MFA for your federated users using a third party MFA provider.
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