Is there a way to disable second screen via GP or Reg after Outlook auto add's your account?

Heather_Kuhn 

Here are my notes which worked for multiple customers on this..

HKCU\Software\Microsoft\Office\16.0\Outlook\AutoDiscover

ZeroConfigExchange = 1 (DWORD)

How to manually create additional Outlook 2016 profiles with ZeroConfigExchange in place

https://support.microsoft.com/en-us/help/4046818/zeroconfigexchange-outlook-manually-create-additional-profile

ZeroConfigExchange - Automating the Creation of an Outlook Profile for Exchange Accounts

https://techcommunity.microsoft.com/t5/Outlook-Global-Customer-Service/ZeroConfigExchange-Automating-the-Creation-of-an-Outlook-Profile/ba-p/389691

When I performed this prior to profile being present on machine, Outlook was 100% silent.  This worked on first launch.. if I already had a profile on the machine it didn't work, I got Outlook profile prompt.  To troubleshoot I recommend you logon with another profile, use the "Advanced System Settings" feature from My computer to access User Profiles button and ensure the test account profile your using doesn't exist or delete it prior to test.

I also used process monitor to "trust and verify" that Outlook process checked and found this key on launch.

Finally, make sure you're following this process when creating a Windows "image" including Office 365 ProPlus.

Deploy Office 365 ProPlus as part of an operating system image