IO Operations not running on android when building using IL2CPP

I have been struggling with this issue for so long...here's the code...
` var json = "{ "99", "11" }" File.WriteAllText(Path.Combine(Application.persistentDataPath, "test.json")); `
the problem is that the above code works fine when using Gradle or the internal building system with mono, but never with il2cpp.

any help would be greatly appreciated...