Hi there,
Did not find anything related but was told by account manager to post here for help.
I have updated our IronSource SDK to latest (6.9.1.1) for this I needed to update the AdMob adapter (4.3.4). There is now a requirement for AdMob to use AndroidX libraries. It is not easy for us to upgrade to AndroidX because of other libraries we are using. It does state on the IronSource page that
In cases when AdMob ad source is required, but a migration to AndroidX is unwanted, please reach the account manager or contact us.
AdMob onRewardedAdFailedToLoad ca-app-pub-[our id] The ad request was successful, but no ad was returned due to lack of ad inventory( 3 )
AdMob:onInterstitialAdLoadFailed(errorCode:510, errorMessage:Load failed - The ad request was successful, but no ad was returned due to lack of ad inventory( 3 ))
Google Ad Lead / AdMob ( 3.18.3 )