With the Ads.txt plugin you only need to use this if you are WordPress plugin integrated. If you are Cloud Integrated (Name server or Cloudflare) you do not need the plugin.
If you have an Ads.txt Manager account ID you should be sure that this is up to date in your Ezoic Dashboard for Ads.txt. Which you can find under the monetization tab: https://support.ezoic.com/kb/article/everything-you-need-to-know-about-adstxt.
If you want to resolve the redirect issue being reported you can go to step 7 in the guide above and try making sure this is setup in your htaccess file.