I'm with business account on build server and visual studio
My build host is connected:
On diagnose, just the last step isn't pass, is "out dated"
The IOS project is the start up project.
The solution's configuration and platform are "Debug" or "Release" and "IPhoneSimulator" or "IPhone":
Check the attached image.
On XCode and Mac's Xamarin I can run on simulator or device.