Native Express AdView Not Displayed
<p>I have added the native express adview from firebase into my app
it loads fine when i use the test id provided by them but when i replaced it with my publisher id and unit id,it stops displaying it</p>

<p>LogCat</p>

<pre><code>Starting ad request.
Use AdRequest.Builder.addTestDevice("3C5C50F4B6108021A73AB0588B9E62C0") to get test ads on this device.
There was a problem getting an ad response. ErrorCode: 0
Failed to load ad: 0
Ad is not visible. Not refreshing ad.
Scheduling ad refresh 60000 milliseconds from now.
</code></pre>

<p>Code
XML</p>

<pre><code>&lt;com.google.android.gms.ads.NativeExpressAdView
                android:id="@+id/adView1"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_centerHorizontal="true"
                android:layout_alignParentBottom="true"
                android:layout_gravity="center_horizontal|center"
                ads:adSize="FULL_WIDTHx80"
                ads:adUnitId="@string/ad_unit_id"&gt;
            &lt;/com.google.android.gms.ads.NativeExpressAdView&gt;
</code></pre>

<p>JAVA</p>

<pre><code>     MobileAds.initialize(getApplicationContext(), APIClass.PUBLISHER_ID);
NativeExpressAdView adView = (NativeExpressAdView) findViewById(R.id.adView1);
        adView.loadAd(new AdRequest.Builder().build());
</code></pre>

<p>Will the ads get displayed when i add publish the app to play store</p>