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MFA Server on-Prem, 2 way OTP issue RRS feed

  • Question

  • Hi guys,

    I'm having an issue with one of our customers, using the Microsoft MFA (the on-prem server service).

    MFA authentication is working fine with the MFA Authenticator app.

    But for some users, we have to use 2way OTP.

    The 2 way OTP however, doesn't seem to work.

    It's 50/50 is I even receive an SMS/text message.

    If I do, I reply the message. But nothing happens. After the authentication time out, the authentications on the server is fail.

    When I look at activities on the Azure portal, I see the "test" authentication attempts from my test user. So the request must be delivered towards Microsoft.

    Also I've created a specific firewall ACL, allowing everything out from the MFA on-prem, to make sure that it's not the firewall blocking.

    Any ideas?

    Kind regards


    Tuesday, November 19, 2019 5:42 PM


All replies

  • Two-way SMS is deprecated and not supported after November 14, 2018. Administrators should enable another method for users who previously used two-way SMS. 

    This is documented here:

    Please take a moment to "Mark as Answer" and/or "Vote as Helpful" wherever applicable. Thanks!

    • Proposed as answer by Marilee Turscak - MSFT Tuesday, November 19, 2019 8:45 PM
    • Marked as answer by J.V.A Wednesday, November 20, 2019 6:54 AM
    Tuesday, November 19, 2019 8:45 PM
  • Hi Marilee,

    Thank you very much - this explains a lot.

    Wednesday, November 20, 2019 6:55 AM
  • No problem. You can switch to one-way SMS. I know that's not ideal but it will at least allow them to authenticate. 

    Please take a moment to "Mark as Answer" and/or "Vote as Helpful" wherever applicable. Thanks!

    Wednesday, November 20, 2019 7:58 PM