No ads.txt file was found on this domain. Follow these steps to fix it.

You don’t have ads.txt setup for your domain. If the advertiser is unable to detect the ads.txt information, they are unable to bid on your traffic.

Watch this tutorial:

Tips:

  1. It could take up to 24hrs for the new ads.txt to be crawlable.
  2. When adding a new bidder or demand source, always add their ads.txt information to your pre-existing file and update the one you have uploaded on your root domain.

You can also learn more about ads.txt here.