Integrating Mopub with AdMob mediation - flutter

I am trying to show MoPub ads through mediation with AdMob. and i did everything on the tutorial
but the ads not showing this what i got :
W/MoPubAdapter(26392): 3: No ads found.
W/flutter (26392): onAdFailedToLoad: 3
I/Ads (26392): Ad failed to load : 3
I/flutter (26392): InterstitialAd event MobileAdEvent.failedToLoad
pls help !

Your code is most likely correct, code 3 just means that there are no ads being served from Admob.
See this answer
If you are getting this error, then your code is correct. The issue is that AdMob does not always have an ad to return for every request. This may happen particularly if you have just registered your AdMob publisher ID, as it takes some time and multiple requests before the new ID starts returning ads.
Another reason your fill rate may be low is that you don't have AdSense backfill enabled, or you have filtered out some ads. Check your app settings to see if that is the case.

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I am facing issue related to Huawei Ads kit, after integration of Huawei Ads kit the Ads are not displaying and getting error code : 204.
Please find screenshot of meta-data tag which I added in manifest file :
As I can see screenshot which you shared, currently you are using Lite SDK in order to get more Ads, you can integrate full Ad SDK.
Error code 204 refers no matching Adverts.

google_mobile_ads: Failed to load a banner ad in production on real device

The app I use shows google_mobile_ads on a test device but shows no ads on a real device.
Moreover, it shows this in logs on real device
I/flutter (14971): Failed to load a banner ad: No ad config.
I found some person said that you must publish the application on the store and then download it on your device, and the ads will appear.
Is it true? Is the app must be published before the ads will be shown?
p.s. when using firebase_admob I facing the same issue - on a real device in prod it shows no ads but works with test device, so maybe the issue lays somewhere deeper?
No, you don't need to upload to the store, you can add test device from Admob panel or use test ids to view ads, please review the
document.

Unity Admob Showing Mix of Test and Real ads

I am working in Unity 2020.3.13 using the Google Mobile Ads SDK v6.0.1 package running banners, interstitials, and rewarded ads. My Admob account is in fine standing and has other apps showing real ads without issue, and none of the Admob Ids described below were recently created.
In the Unity editor everything shows as a test ad even though I have set the real app ID and Ad Unit IDs from Admob. The problem is that once the app builds in Xcode the banner ads show as real ads, while the rewarded ads show as test ads still. I have double and triple checked the Ad Unit IDs they are all correct. Any ideas why I am seeing real ads for banners but test ads for Rewarded?
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Flutter : Facebook audience network Banner error_message: No Fill, error_code: 1001 When back to previous route

I got this Error with Fb banner ad when I back to a previous route :
{error_message: No Fill, error_code: 1001, invalidated: false, placement_id: **************}
This message is very obvious, this error means you implemented ad but ad is not filling. You have to upload your app to playstore and then your add will automatically fill.
Note: you have to download your app from playstore then it will show real ad.
I personally face this error and found this solution only.
You can test in test device:
https://developers.facebook.com/docs/audience-network/guides/test/
Following reasons are mention by facebook:
Error 1001 - No Fill. May be due to one or more of the following:
User not logged into Native Facebook App on Mobile Device
Limit Ad Tracking turned on (iOS)
Opt out of interest-based ads turned on (Android)
No Ad Inventory for current user
Your testing device must have the native Facebook application installed.
Your application should attempt to make another request after 30 seconds.

Admob interstitial ads not working in ios6

I am using the latest admob SDK(V 6.2.1) for ios. Ads are not shown on ios6 and gives an error Request Error: No ad to show.
This happens only on ios 6 even if test mode is set to YES or NO. Ads are working fine on versions lower than ios6. Is there any solution for this?
Test mode doesn't work on iOS 6 devices as per this forum post.
If you want to get test ads to show up, you will have to use testDevices and pass in the ID you get from the AdSupport library (instructions here).
If you want to test your ad click flow though I'd take the forum post's suggestion and create a house ad campaign fully allocated to a test publisher ID, and use the test publisher ID into your applications to test.