Over the past several months you’ve told us that adding Conditional Access to Microsoft 365 Business would help it secure SMB customers more comprehensively. Today, we are excited to announce the ava...
Updated Apr 17, 2025
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We had the same problem, M365B with NPS extention didn't work..
This website did the trick: http://azuredummies.com/2019/06/28/azure-mfa-nps-extension-service-principal-name-spn-how-to-deal-with-it/
You need the to activate a app within Azure AD.