help in getting data back

[eduardoagr]

I have this class

`
public FirebaseServices(string databaseUrl) {
_firebaseClient = new FirebaseClient(databaseUrl);
}

    public async Task<LocalUser>? GetAsync(string Node, string id) {
        var result = await _firebaseClient
            .Child(Node).Child(id)
            .OnceSingleAsync<LocalUser>();

        if (result == null) {
            return null;
        }

        return result;
    }

    public async Task<IReadOnlyCollection<FirebaseObject<LocalUser>>> GetAllAsync(string Node) {

        var FireUsers = await _firebaseClient
           .Child(Node)
           .OnceAsync<LocalUser>();

        return FireUsers;

    }

    public async Task<FirebaseObject<LocalUser>> CreateAsync(string Node, LocalUser user) {

        var newUser = await _firebaseClient.Child(Node)
        .PostAsync(user);

        return newUser;
    }



    public async Task UpdateAsync(UserData UserToUpdate) {
        await _firebaseClient.Child(UserToUpdate.Key).PutAsync
            (UserToUpdate.Object);
    }

    public async Task DeleteAsync(string path) {
        await _firebaseClient.Child(path).DeleteAsync();
    }
}

}
`

But for some reason the GetAllAsync bring me data, but the GetAsync doesn't

this is my data

{"Key":"-NNpL5Gb1I9O5Usd12ci","Object":{"Email":"a@a.com","Password":"123456","FirstName":"a","LastName":"a","Username":"a","Confirm":null,"DateOfBirth":"2018-05-05T00:00:00","DateOfBirthString":"5/5/2018","DateOfSuscriptionStartString":"1/1/0001","DateOfSuscriptionEndString":"1/1/0001","Id":"DqPTMCpLNfeZuYBfixrIHyxmDZB2","City":"Madrid","HasPaid":false,"IsActive":false,"SuscriptionStartDate":"0001-01-01T00:00:00","SuscriptionEndDate":"0001-01-01T00:00:00","Country":"Espa\u00F1a","PhotoUrl":null,"Age":4}}