googleads-mobile-unity Ads not initialising on Android

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[REQUIRED] Step 1: Describe your environment

Unity version: 2020.3.19f1
Google Mobile Ads Unity plugin version: 6.1.1
Platform: Android (iOS, Android, Unity Editor)
Platform OS version: Android 10 (eg iOS 10, Android 9)
Any specific devices issue occurs on: General
Mediation ad networks used, and their versions: No mediation

[REQUIRED] Step 2: Describe the problem

Steps to reproduce:

Hello!

I've been implementing the AdMob ads via Google Mobile Ads Unity plugin in my Unity game. The project works in when running in the Unity Editor or when I build the project to iOS. When I try to run the Android build, which succeeds, the initialisation process of the game gets stuck while trying to initialise the Mobile Ads. The dependancies have been resolved successfully and the game gets no error. The only warning I could find that could be related to this is the following:

Warn GmsClient unable to connect to service: com.google.android.gms.leibniz.events.service.START on com.google.android.gms

The Initialise function also does not call the callback function. I am stumped because the iOS build is working without an issue without any problems. The following code is the initialisation function of the wrapper used to decouple the ad serving process. The first Debug.Log gets called while the second one inside the action does not. It also means that the RefeshAds function also does not get called.

Relevant Code:

public void InitializeAdController() { this.masterAdControllerInitialization = true; #if UNITY_IOS this.adsConfiguration = this.iosAdsConfiguration; #elif UNITY_ANDROID this.adsConfiguration = this.androidAdsConfiguration; #elif UNITY_EDITOR this.adsConfiguration = this.iosAdsConfiguration; #endif

    Debug.Log("Starting Ads Initialization");
    MobileAds.Initialize(initializationStatus =>
    {
        Debug.Log("Action Started");
        Dictionary<string, AdapterStatus> adapterStatusMap = initializationStatus.getAdapterStatusMap();
        bool initializationDone = true;
        foreach (AdapterStatus adapterStatus in adapterStatusMap.Values)
        {
            if (adapterStatus.InitializationState == AdapterState.NotReady)
            {
                initializationDone = false;
                break;
            }
        }
        if (initializationDone)
        {
        RefreshAds();
        }
    });
}