Admob shows Test ads but my ads not showing

I'm using admob for showing android ads.my real ads not showing but when i try the test code it work . i tray my ads in other game and it work but in this game no . i creat this game by buildbox

private static AdRequest getAdRequest(){
    // Create an ad request. Check your logcat output for the hashed device ID to
    // get test ads on a physical device. e.g.
    // "Use AdRequest.Builder.addTestDevice("ABCDEF012345") to get test ads on this device."
    AdRequest adRequest = new AdRequest.Builder()
            // uncomment to get test ads
            //.addTestDevice("YOUR_DEVICE_ID")
            .build();
    return adRequest;