Modern authentication question

Shahin Mortazave 456 Reputation points


We are having an issues with MFA for our organization,
We are using the office365 since 2016, now we want to enable the MFA for somoe of our users. We did enable it for a test user and user setup the MFA and can open sharepointonline and exchange online OWA with MFA, but when he to open the Outlook 2019 on thier mobile devices he must use an app password.
i did check the our tenant and it looks like that modern autentication is not enabled

OAuth2ClientProfileEnabled : False

Does enabling the moderen authentication affect users that are using MFA? we dont want users that dont use MFA being affected.


Azure Active Directory
Azure Active Directory
An Azure enterprise identity service that provides single sign-on and multi-factor authentication.
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  1. Shahin Mortazave 456 Reputation points

    Hi michev,

    Does enabling the modren authentication have any impact on the users that have already configured the outlook 2019 on thier machines before enabling the the modern authentication?
    We have already setup the SSO with azure so our users in the domain dont need to enter password when opening the sharepoint or other web based office 365 applications.


  2. Shahin Mortazave 456 Reputation points

    Thanks for your reply
    Just one quick question,
    We have also an on-premise Lync 2013 server in our enviornment, does enabling the modren authentication on our tanent and for outlook 2019 would be enough? or for MFA and SFB that using on-prem Lync server need extra configuration?


  3. Shahin Mortazave 456 Reputation points

    Thank you for your reply,

    and this is the right cmdlet correct?

    Set-OrganizationConfig -OAuth2ClientProfileEnabled $true

  4. Vasil Michev 66,601 Reputation points MVP

    You can think of "Modern authentication" as a prerequisite for MFA, so no it will not affect users that have been already set up. It will simply enable non-browser clients that connect to Exchange Online to use MFA. The client still needs to support modern auth, currently the Outlook app and the Mail client on iOS do that.

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