After applying the December 2016 update I have attempted to set up the App for Outlook.
When opening the app I see the ADFS login screen appear in a popup window. I complete the login details but am then just shown a blank web page instead, and the "Having trouble signing in?" message is displayed within the app.
There are further reports of this issue on the community site at https://community.dynamics.com/crm/f/117/t/221514?pi51685.