Can’t find an element on iOS in my xamarin ui tests

I wrote some tests on android and now I’m trying to make it compatible to iOS too.

I have some picker :
enter image description here

I gave the picker automation id and also to the label inside him so I can read it text,

in android I succeed but in iOS I can’t even see the label.

tree repl in iOS :
Ios repl tree

tree repl in android:
android repl tree

why this is happening ?
how can I read the label’s text ?

Source: Xamarin.ios Questions