Hello,
We apologize for the issue you are facing with the robots.txt file on your client’s website. Since you’ve confirmed that there is no physical robots.txt file, no permission issues, and no other SEO plugins, let’s explore a few potential solutions:
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Check Rank Math Mode: Ensure that you are using the Advanced Mode in Rank Math. If you are in Easy Mode, the option to edit the robots.txt file may not be visible. You can switch to Advanced Mode by navigating to WordPress Dashboard → Rank Math SEO and enabling Advanced Mode.

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Clear Cache: Sometimes, caching plugins or server-side caching can cause issues with displaying updated settings. Clear any cache on your site and check again.
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Check for Conflicts: Temporarily disable other plugins (if any) to see if there is a conflict preventing the display of the robots.txt settings.
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Debugging: If the above steps do not resolve the issue, consider enabling debugging in WordPress to see if any errors are being logged that could provide more insight into the problem.
If you continue to experience difficulties after trying these steps, please reply to this ticket, and a human agent from our support team will assist you further. Thank you for bringing this concern to our attention!
Sources:
Common robots.txt Issues & How to Fix Them » Rank Math
This is an automated reply from Rank Math Support Bot. Your ticket has been assigned to a human agent and we will get back to you shortly.
Hello,
Please make sure you’re using the latest versions of the Rank Math free (v1.0.256) and PRO (v3.0.99) plugins on your website: https://rankmath.com/changelog/
If the issue persists, please head over to your WP Dashboard > Rank Math > Status & Tools > System Status, click the “Copy System Info to Clipboard” button, and paste it here so we can check this further for you.
Let us know how it goes. Looking forward to helping you.
Thank you.
Hello,
Please try again using a different browser or in the incognito/private mode of your current browser and see if that works for you.
If the issue persists, we might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.
Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
Let us know how it goes. Looking forward to helping you.
Thank you.