Once When you open the Deliver app has been downloaded and opened, on the user will be prompted to Tap to Authenticate. When the user taps the Authenticate option on the screen, a pop-up asking for their sign-in information appears. The user will enter their device, you are prompted to "Tap to authenticate."
Tap Authenticate to open a Sign in pop-up window.
Enter the email address and password for the correct D365 client to log in. 
