ApiAiSDK.SupportedLanguage.FromLanguageTag(Language) doens't works

[newrochelle]

SupportedLanguage supLang = ApiAiSDK.SupportedLanguage.FromLanguageTag(Language);

supLang is always equal to "en" even if Language is "French".

i'm using version 1.6.5 of ApiAiSDK

below "SupportedLanguage" class (from metadata):
/********/
namespace ApiAiSDK
{
public class SupportedLanguage
{
public static readonly SupportedLanguage English;
public static readonly SupportedLanguage Russian;
public static readonly SupportedLanguage German;
public static readonly SupportedLanguage Portuguese;
public static readonly SupportedLanguage PortugueseBrazil;
public static readonly SupportedLanguage Spanish;
public static readonly SupportedLanguage French;
public static readonly SupportedLanguage Italian;
public static readonly SupportedLanguage Dutch;
public static readonly SupportedLanguage Japanese;
public static readonly SupportedLanguage ChineseChina;
public static readonly SupportedLanguage ChineseHongKong;
public static readonly SupportedLanguage ChineseTaiwan;
public readonly string code;

    public static SupportedLanguage FromLanguageTag(string languageTag);
}

}
/********/

How can I fix it?

Many thanks in advance.

Best regards
Andrea