Admob No fill from ad server - failed to load ad: 3

Question

My issue is that ads are not being displayed at all in my app, test mode or not. I am going to keep this question specific to test mode, and once I get that working I will w

Answer 1

It might be because you're not waiting for the ad to load.

For me implementing the AdLoaded method of the AdListener did the job.

    mAdInterstitial.loadAd(AdRequest.Builder().addTestDevice("XXXXXXX").build())
    mAdInterstitial.adListener = object : AdListener() {
        override fun onAdLoaded() {
            mAdInterstitial.show()
        }
    }