I added an IP range to MFA, but I'm still getting prompted. How can I troubleshoot this? How long does it take for the settings to go into effect?

Hi Dean, you have to keep in mind that for your setting to work you'll have to set external IPs as trusted IPs for MFA. So for example when you access your resources from within your company's network you don't have to use MFA whereas you will need to authenticate via second factor when accessing from outside of your company. Just as Nils mentioned your settings should be active almost instantly. Regards,Tom

Trusted IPs for MFA | Microsoft Community Hub

Nils van Woensel
Copper Contributor
Sep 26, 2016
For me the setting was active almost directly. At least within minutes.
- Dean_Gross
  Silver Contributor
  Sep 26, 2016
  What is the best way to determine the IP range that should be used?
  - Tom Janetscheck
    Brass Contributor
    Sep 29, 2016
    Hi Dean,
    
    you have to keep in mind that for your setting to work you'll have to set external IPs as trusted IPs for MFA. So for example when you access your resources from within your company's network you don't have to use MFA whereas you will need to authenticate via second factor when accessing from outside of your company. Just as Nils mentioned your settings should be active almost instantly.
    
    Regards,
    Tom

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