AdMob Reward Ad Error

Hello,

I’ve managed to get Reward Ads working in a basic Android app (Not monogame). But when I ported the code into my monogame code, I get the following errors:

[Ads] Fail to instantiate adapter com.google.DummyAdapter

[Ads] Failed to load ad: 3
OnRewardedVideoAdFailedToLoad

It doesn’t crash, but it won’t even load the test ad, even if I set up a test device.

Essentially my implmentation is:

MobileAds.Initialize(Game.Activity);
RewardedVideoAd = MobileAds.GetRewardedVideoAdInstance(Game.Activity);
RewardAdListener = new RewardAdListener();
RewardedVideoAd.RewardedVideoAdListener = RewardAdListener;

Followed by:

public void ShowRewardVideo()
{
if (RewardedVideoAd.IsLoaded)
{
RewardedVideoAd.Show();
}
}

I’ve done some searching and people mention setting up the screen as responsive, although I can’t find this setting. Has anyone had any luck with any of this?