Test User-Login with DIFFERENT(!) users in Xamarin Test Cloud

i want to test the login-routine of my app with Xamarin Test Cloud. Creating the test-scenario is no problem, but i want the Xamarin Test Cloud to test the login of different users simultaneously.

Is there any way to hand over the Test Cloud an array (in the test-scenario code) with the login-data, so that any testing-device uses a different login?

Or is Xamarin Test Cloud just for the one complete same test-scenario on multiple devices?

Thanks for your help!

Link to website: http://ift.tt/1RAk6Jx