I put an ad with admob but it gives an error

[eneskaplan34]

11-23 17:49:35.157 10702 10921 W Ads     : Not retrying to fetch app settings
11-23 17:49:35.187  2518 10892 W Ads     : Received error HTTP response code: 400
11-23 17:49:35.191 10702 10702 I yoyo    : Banner Ad onAdFailedToLoad
11-23 17:49:35.192 10702 10702 I Ads     : Ad failed to load : 0
11-23 17:49:35.229  2518 10929 I Ads     : SDK version: afma-sdk-a-v19649999.15000000.1
11-23 17:49:35.443  2518 10929 W Ads     : Received error HTTP response code: 400
11-23 17:49:35.443 10702 10702 I Ads     : Use AdRequest.Builder.addTestDevice("12817C88E6D07F18CD75EFC61F936CD1") to get test ads on this  : 0

why it gives error

Reward ads :

if (game.rewarded_loaded) {
    global.duvark = 3;
} else {
 
}

if (device_mouse_check_button_pressed(0, mb_left) && position_meeting(mouse_x, mouse_y, self)) {
    if (game.rewarded_loaded) {
        GoogleMobileAds_ShowRewardedVideo();
        game.rewarded_loaded = false;
    } else {
        GoogleMobileAds_LoadRewardedVideo(game.rewarded_id);
    }
}

Data: Game Start event

ads_app_id     = "ca-app-pub-5816347274633366~5457785557";
banner_id      = "ca-app-pub-5816347274633366/1650047260";
rewarded_id      = "ca-app-pub-5816347274633366/8870061735";
interstitial_id  = "ca-app-pub-5816347274633366/7756645835";

//Initialize extension
GoogleMobileAds_Init(interstitial_id, ads_app_id);
GoogleMobileAds_LoadInterstitial();
interstitial_loaded = false;

GoogleMobileAds_LoadRewardedVideo(rewarded_id);
rewarded_loaded = false;
rewarded_viewed = false;

GoogleMobileAds_UseTestAds (true, "E3DAE5ACB5072BA36197B94E287927C9");

 

[MrBazooka]

Hi there. Look at this article https://help.yoyogames.com/hc/en-us/articles/360002971751-iOS-and-Android-Google-Mobile-Ads-Setup
For one, you're missing the async social event and you're not using test ad units. Be careful you can get your Admob account suspended if you're not using test ads while your game/app is not released yet.

See below for test ad ids for ios and android.
IOS:
https://developers.google.com/admob/ios/test-ads

Android:
https://developers.google.com/admob/android/test-ads