You're prompted for Exchange credentials after switching network in a Skype for Business hybrid environment

Applies to: Skype for Business 2016Skype for Business 2015Microsoft Lync 2013

Symptoms


In a Skype for Business hybrid environment, when you sign in to the Skype for Business client after switching the network, you may find you're prompted to enter Exchange credentials. This issue occurs when the Skype for Business client uses basic authentication to sign-in but Exchange Online uses modern authentication (ADAL).

Resolution


To fix this issue, install one of the following updates:

Note Lync 2013 was upgraded to Skype for Business in April 2015.