Thank you very much! Issue resolved.
After Yoast support prompt, I found this info and understood where was the problem:
“By default, WordPress automatically creates a virtual robots.txt file for your site. So even if you don’t lift a finger, your site should already have the default robots.txt file. You can test if this is the case by appending “/robots.txt” to the end of your domain name.
Because this file is virtual, though, you can’t edit it. If you want to edit your robots.txt file, you’ll need to actually create a physical file on your server that you can manipulate as needed.`”
source: https://kinsta.com/blog/wordpress-robots-txt/
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This reply was modified 4 years, 5 months ago by elenigram.
