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How can I Block or Restrict Exchange mail user to login from specific country or region (Exchange Server 2016 onprem) either outlook or webmail/owa?
If above is not possible what are the steps to enable mfa for outlook and owa users.
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use Modern Hybrid Auth with a Azure Conditional Access policies to block users and enforce MFA
https://learn.microsoft.com/en-us/microsoft-365/enterprise/configure-exchange-server-for-hybrid-modern-authentication?view=o365-worldwide
https://learn.microsoft.com/en-us/microsoft-365/enterprise/hybrid-modern-auth-overview?view=o365-worldwide