How do configure Skype For Business to not start when macOS starts? Skype For Business 16.2.145 automatically starts and sign's in when my machine starts.

The usual solutions for Skype don't work for Skype for Business. I cannot change this setting in the dock or in the app's preferences.

How do I change this setting?
Check System Preferences - Accounts for Sierra, Users and Groups for Catalina - Login Items and make sure it's added there. 

Alternative 1: 

Open the context menu on the icon in the dock -> options -> uncheck "open at login".

Alternative 2: 

Open the terminal and type launchctl list | grep skype. 

Then use sudo launchctl remove &lt;name from the previous output&gt; to prevent it from starting at login.