robots.txt is not validLighthouse was unable to download a robots.txt file

Hello!

As for the title of this topic, this appears to be a widespread issue with Lighthouse, regardless of the SEO plugin. Please see https://www.ads-software.com/support/topic/robots-txt-error-2/#post-17521699.

As for the content of your request, TSF’s robots.txt output is virtual; there’s no stored file. This is done to support complex networks, and WordPress itself actually manages the output.

Still, I recommend blocking robots to /cdn-cgi/ via .htaccess or a firewall rule instead of exposing the endpoint in the robots.txt file. But you can edit the robots.txt virtual output via this plugin: https://www.ads-software.com/plugins/robots-txt-quick-editor/.