Suddenly the iPhone simulator can no longer be found with an error that device xxx-xxx-xxx-xxxx (id changes based on simulator chosen). This happens on both VS 2017 and VS 2019 (Windows 10). The device id's can be found on the Mac, the simulators work on the Mac, and if you uncheck the box for "Remote Simulator to Windows" it will launch the app on the simulator on the Mac. I have tried all the suggestions I found but it still doesn't work. Uninstalled Xcode and reinstalled on the Mac. Uninstalled VS 2019 and reinstalled, cleared the caches on both, including clear the MEF cache using the VS extension. I forget the Mac and reconnect, still erroring. I created a test Xamarin app using the VS template and still the same issue. Recently Xcode and Mac OS was updated, however the other developer updated Mac OS and Xcode as well, but the simulators are still working fine for him. I would be grateful for any help.