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This week I needed to create a demo environment for my presentation at SharePoint Saturday in the Netherlands and I Installed the latest version of Azure Active Directory Connect (1.1.524.0) and to my surprise it supported modern authentication when I connected to Azure Active Directory. I created an account where MFA was disabled to make the connection but that was not necessary to my surprise. See the screenshot below asking Azure Active Directory Connect for sign into my tenant.
This is a repost from my company blog