MobileService.InvokeApiAsync skips

Hello,
I am developing an app using Xamarin.Forms to re-use as much code as possible.
Specifically, I have a static class that manages all the POST/GET requests to my Azure Web Server.
Everything single call works fantastically except for one call - this one:

 public async static Task<Models.UserParkPosition> GetUserParkPositionForCurrentUserAsync()
        {
            var body = new JArray
            {
                App.User.Id
            };

            var test = await AzureMobileServiceClient.Instance.MobileService.InvokeApiAsync<JArray, Models.UserParkPosition>(ConnectionsAPI, body, HttpMethod.Get, null);
            return test;
        }

The method above is called when the user presses a button - specifically like this:

        private async Task OnGoingToTheParkClicked(object sender, EventArgs e)
        {
            bool success = false;
            var already = await viewModel.AlreadyHavePendingRequestAsync());
        Console.WriteLine("TEST");
            throw new Exception();
    }

When the debugger hits the "var test" line mentioned, above.... nothing happens. The code doesn't deadlock, the UI is still responsive, but the code never returns. I never see the "TEST" word and the exception is not even thrown... what happens??
All my other APIs are called in the same way, and are working correctly.

OTHER INFO:
- Same code works on UWP and Android
- The GET request arrives at the webservice, which responds in a timely fashion (< 1 sec)

Thanks to anyone who might help or even point me in the right direction!