App crashes upon clicking on ads button on iOS Devices

Unity Services
,
1

I have created a game for both iOS and Android.

I have successfully uploaded the game for Android and it works perfectly fine, game runs smoothly, ads and IAP working as it supposed to.

However, when I upload my game onto App Store, upon clicking the button that was supposed to show ads, the game crashed instantly. I have made certain adjustments but none have helped in solving the issue.

Things to note:
I am using Unity 2018.3.8f1 Personal
I am using XCode 11.2.1
I have imported Unity Monetization 3.3.0
I have turned off Ads in the services panel

These are my my configurations for UnityConnectSettings:

UnityAdsSettings:
m_Enabled: 0
m_InitializeOnStartup: 1
m_TestMode: 0
m_IosGameId: 3221231
m_AndroidGameId: 3221232
m_GameIds:
AndroidPlayer:
iPhonePlayer:
tvOSPlayer:
m_GameId:

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Monetization;

public class AdsManager : MonoBehaviour
{
    public bool finishads = false;

    private string gameId = "3221231";

    string video_ad = "video";
    string rewarded_video_ad = "rewardedVideo";

    private bool testMode = false;
    // Start is called before the first frame update
    void Start()
    {
        if (Application.platform == RuntimePlatform.IPhonePlayer)
            gameId = "3221231";
        else if (Application.platform == RuntimePlatform.Android)
            gameId = "3221232";

        Monetization.Initialize(gameId, false);

    }

    public void ShowAd()
    {
        StartCoroutine(WaitForAd());
    }
    public void ShowRewardedAd()
    {
        StartCoroutine(WaitForAd(true));
    }
    IEnumerator WaitForAd(bool reward = false)
    {
        string placementId = reward? rewarded_video_ad : video_ad;
        while (!Monetization.IsReady(video_ad))
        {
            yield return null;
        }

        ShowAdPlacementContent ad = null;
        ad = Monetization.GetPlacementContent(video_ad) as ShowAdPlacementContent;

        if (ad != null)
        {
            if (reward)
                ad.Show(AdFinished);
            else
                ad.Show();
        }
    }

    void AdFinished(ShowResult result)
    {
        if (result == ShowResult.Finished)
        {
            finishads = true;


        }
    }
}

I believe there is nothing wrong with the codes as it works as it should on Android devices but these are the codes that I am using in the project.

One more thing to note, I am using Windows to build the iOS APK then transfer it over to a Macbook to build using XCode. When I build with XCode, I never change any of the settings and built normally.

Hope someone is able to help me solve this issue.

Thanks!

2

A device log from the crash would be helpful in determining the issue. Here are some instructions on how you can capture XCode logs: