Azure Active Directory (Azure AD) "baseline" policies are being removed and replaced with "security defaults", a more comprehensive set of protection policies for you and your customers. Security defaults can help protect your organization from identity-theft related security attacks.
Your multifactor authentication (MFA) implementation will be removed due to the baseline policies retirement if you haven't transitioned from baseline policies to the security defaults policy or other MFA implementation options. Any users in your partner tenants performing MFA protected operations will be requested to complete MFA verification. Review more detailed guidance at Mandating multifactor authentication for your partner tenant.
To stay compliant and minimize disruptions, take one of the following actions:
Transition to security defaults
Security defaults policy is one of the options that partners can choose to implement MFA. It offers a basic level of security enabled at no extra cost.
Learn how to enable MFA for your organization with Azure AD and review the security defaults key considerations.
Enable security defaults policy if it meets your business needs.
Transition to Conditional Access
If security defaults policy doesn't serve your needs, enable Conditional Access. For more information, review the Azure AD Conditional Access documentation.