So I have noticed a bug(Probably with my code not gamesparks) where you can post score to server perfectly first time after creating account however if you then sign into that account again or another previously created account the score doesnt post which I don't understand as its the same function for posting code for a new player as previously created players and non of my debug stuff is showing any errors. 

Think the issue is in this script as the create profile and login scripts are identical:

using UnityEngine;
using System.Collections;
using GameSparks.Api.Requests;

public class APIManager : MonoBehaviour {

	public MenuManager menuMan;
	public GetLeaderboardScore getScore;

	void Awake()
	{
		bool nameOk = false;
		bool passOk = false;

		string pName = PlayerPrefs.GetString("PlayerName");
		string pKey = PlayerPrefs.GetString("PlayerKey");

		//Check if User has previously logged in or created an account
		//Check Username
		if(string.IsNullOrEmpty(pName))
		{
			Debug.Log ("Auto Login Name Error");
			nameOk = false;
		}
		else
		{
			Debug.Log ("Auto Login Name Success. Name =: " + pName);

			nameOk = true;
		}

		//Check Password
		if(string.IsNullOrEmpty(pKey))
		{
			Debug.Log ("Auto Login Pass Error. Key =: ");
			

			passOk = false;
		}
		else
		{
			Debug.Log ("Auto Login Pass success" + pKey);
			

			passOk = true;
		}

		//Check bools are true for auto login
		if(nameOk == true && passOk == true)
		{
			AutoLogin(pName, pKey);
		}
	}

	void AutoLogin(string userName, string password)
	{
		//Show Auto Login panel
		menuMan.ShowAutoLogin();

		//Check Account details
		new AuthenticationRequest().SetUserName(userName).SetPassword(password).Send((response) =>
		                                                                             {
			if (response.HasErrors)
			{
				Debug.Log("Unable to autologin");

				//Hide auto login panel
				menuMan.HideAutoLogin();

				//**SHOW AUTO LOGIN ERROR POPUP**
				menuMan.ShowAutoLoginErrorPopup();

			}
			else
			{
				Debug.Log("Successfully Auto Logged in as " + userName);

				//Hide auto login panel
				menuMan.HideAutoLogin();

				//Get score
				getScore.FindHighScore();
				
				//Show Ok Popup
				menuMan.ShowAutoLoginSuccessPopup();
			}
		});
	}
		
		public void CreateProfile(string userName, string password, string displayName)
	{
		//Create account here
		new RegistrationRequest().SetUserName(userName).SetPassword(password).SetDisplayName(displayName).Send((response) =>
		                                                    {
			if (response.HasErrors)
			{
				Debug.Log("Something failed with connecting with Username");
				
				//** SHOW ERROR POPUP HERE**
				menuMan.ShowErrorPopup();
			}
			else
			{
				Debug.Log("Successfully Created profile as " + userName);
				//Here you can display some information                                                                             
				//to the user that they are logged in...
				
				//SET USER INFO FOR AUTOLOGIN
				PlayerPrefs.SetString("PlayerName", userName);
				PlayerPrefs.SetString("PlayerKey", password);

				//Get Old Highscore to 0 on new account
				getScore.NewAccount();
				
				//Show ok popup
				menuMan.ShowSuccessPopup();

				//Show Menu
				//menuMan.ShowMenu();
				//Hide SignUp
				menuMan.HideSignup();
			}
		});
	}

	public void Login(string userName, string password)
	{
		//Check Account details
		new AuthenticationRequest().SetUserName(userName).SetPassword(password).Send((response) =>
		                                                                                                       {
			if (response.HasErrors)
			{
				Debug.Log("Something failed with connecting with Username");
				
				//** SHOW ERROR POPUP HERE**
				menuMan.ShowErrorPopup();
			}
			else
			{
				Debug.Log("Successfully Created profileas " + userName);
				//Here you can display some information                                                                             
				//to the user that they are logged in...

				//SET USER INFO FOR AUTOLOGIN
				PlayerPrefs.SetString("PlayerName", userName);
				PlayerPrefs.SetString("PlayerKey", password);

				//Get score
				getScore.FindHighScore();

				//Show Ok Popup
				menuMan.ShowSuccessPopup();

				//Show Menu
				//menuMan.ShowMenu();
				//Hide Login
				menuMan.HideLogin();
			}
		});
	}
}

I had error looking something similar. The scores weren't recorded after first try. Than I spotted that the scores lower than previous were recorded. The reason was - I had selected MINIMUM. In my case correct value was MAXIMUM.

Sorry, I should make it more clear:
You can switch to MAXIUM from Events screen > Edit Event > Attributes > Default Calc

thanks but mine is def set to maximum and its works when you first create an account but then logging back in or logging into another previously made account doesnt post a score

Pretty certain its working in test harness. Just posted 3 scores and all could be found in the leaderboards. I think I may have found the culprit in my unity code. Im using the same function for when I login as the one I use to check if player high score. 

public void FindHighScore() 
	{
		//the leaderboard entries could contain old data. 
		//First destroy all existing Leaderboard objects
		for (int i = 0; i < entries.Count; i++)
		{
			Destroy(entries[i]);
		}
		
		//because we deleted the objects contained on the list, the list                //now contains nul references and has to be cleared so the new 
		//high score objects can be added
		entries.Clear();

		new AroundMeLeaderboardRequest_highScoreLeaderboard().SetEntryCount(1).Send((response) => {
			
			//what we will do with the information given by GameSparks
			foreach (var entry in response.Data)
			{
				string serverName = entry.UserName.ToString();

				string playerName = PlayerPrefs.GetString("PlayerName");
				
				if(serverName == playerName)
				{
					string playerScore = entry.GetNumberValue("score").ToString();

					Debug.Log("PlayerFound " + playerName + "HighScore " + playerScore);

					PlayerPrefs.SetString("OldHighScore", playerScore);
				}
			}
		}); 
	}

 So going to change this and see if that solves the issue. 

That was the issue. I was setting the wrong PlayerPrefs on login so it thought the score was a new highscore so it would post it to the server but the server would realise it wasn't a new score and discard it.