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Microsoft Entra Blog
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Azure AD Conditional Access support for blocking legacy auth is in Public Preview!

Alex_Simons's avatar
Alex_Simons
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Sep 07, 2018
First published on CloudBlogs on Jun, 07 2018 Howdy folks, Today I'm excited to announce the Public Preview of Azure AD Conditional Access support for blocking legacy authentic...
Updated Jul 24, 2020
Version 9.0
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Lennard Kuijten's avatar
Lennard Kuijten
Copper Contributor
Nov 26, 2018

I takes up to 24 hours after the policy is enabled, before legacy authentication will be blocked.

Take notice, when you are using AD FS to authenticate with Azure AD. Password Spray attacks directly on your AD FS (sts.domain.com) will not be blocked with this policy. You need to migrate to PTA or Password hash to prevent this.