Web: https://www.reddit.com/r/AZURE/comments/s03c4j/azure_ad_legacy_auth_conditional_access/

Jan. 9, 2022, 10:24 p.m. | /u/nickbrown1968

Microsoft Azure reddit.com

Can anyone point me to a definitive, authoritative source that states whether conditional access rules are processed when legacy auth is used?

These reputable sites suggests that they are not (and align with my understanding of how legacy auth works):

How to Harden your SharePoint Online Environment by Disabling Legacy Authentication (stealthbits.com)

“Since conditional access policies are evaluated as a part of the authentication process, this only works for modern authentication which supports directly using Azure AD as the identity provider. This does not work for legacy authentication because …

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