akavache not caching in ios simulator/device

using xamarin forms v.3.1 and akavache v5 + akavache.sqlite3 v5.

in app.xaml.cs I initialized akavache

       BlobCache.ApplicationName = "EF_Cache";
       BlobCache.EnsureInitialized();

And to cache data i use localmachine

`   await BlobCache.LocalMachine.InsertObject<List<int>>("FavouriteTeams", FavouriteTeam, TimeSpan.FromDays(300));`

To retrieve data i do

 `  var FavouritesList = await BlobCache.LocalMachine.GetObject<List<int>>("FavouriteTeams");`

The following code works fine in android devices with no issue but when i tried it on ios device/simulator it fails with no errors, the getobject<> just return null when restarting the app.

is there any thing is missing or an extra thing should be configured in ios apps in properties or info.plist.