Xamarin.Forms iOS Api can't recognize


Im implementing a mobile multiplatform app with the OpenALPR API.
With Android and UWP it works as expected but with iOS, i don’t know why but the API never detect the correct plate.
When im saving the picture and test it , the recognition with the Api test is correct too.
I’m calling the API in PCL side and the C# code is the same for all of the platforms.
Did anyone had this issue ?

Thanks you