Skype for Business Server Users Client Prompts for Exchange Credentials when enabling Office 365 MFA

 

One we hit inside Modality, we’re currently in hybrid between SfB Online and SfB Server, when enabling users for Office 365 Multi-Factor Authentication

Credit to Internal IT and Microsoft for solving this one. It is documented in this article:  https://support.microsoft.com/en-in/help/3082803/info-about-the-allowadalfornonlyncindependentoflync-setting-in-skype-f

We added the following registry on your computer and rebooted it.

For Skype for Business or Lync 2013 clients 16.0*:

HKEY_CURRENT_USER\Software\Policies\Microsoft\Office\16.0\Lync

Then, apply the AllowAdalForNonLyncIndependentOfLync registry key setting:

“AllowAdalForNonLyncIndependentOfLync”=dword:00000001

 

Once this was added, users were not prompted.