Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
Can you please install the latest version v1.0.98.1
and see if the issue gets resolved?
https://rankmath.com/changelog/free/
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/
We really look forward to helping you.
The issue has been resolved i deactivate and activate rankmath plugin through wordpress recovery mode
Hello,
We are super happy that you have resolved the issue.
If you have other issues with our plugin in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you.
Thank you.