Earnings at risk, How to fix ads.txt file issues in Adsense for Blogger

Authorized Digital Sellers, or ads.txt is an IAB initiative that helps ensure that your digital ad inventory is only sold through sellers (such as AdSense) who you've identified as authorized. Creating your own ads.txt file gives you more control over who's allowed to sell ads on your site and helps prevent counterfeit inventory from being presented to advertisers.

 If there's an issue with ads.txt on your site, you'll see an alert in your AdSense account.
If your blog is monetized with third-party providers or you’ve manually integrated AdSense in your blog, you will need to manually set up the content of the ads.txt file.

Sign in to Blogger.

In the top left, click the Down arrow  .

Click the blog you want to set up an ads.txt file on.

On the left, click Settings.

Under "Settings," click Search preferences.

Under "Monetization," find "Custom ads.txt" and click Edit.

Click Yes.

Copy the settings from your third-party monetization provider and paste them in the text box.

Click Save settings.

Optional: To check the content of your ads.txt file, go to http://<your blog address>/ads.txt.