Hello,
Thanks for contacting us.
Can you please share both the permalink structures, the one you were using before and the one that you are using now?
We really look forward to helping you.
Started with the plain permalink structure, then changed to Post Name. Currently, I have it at Plain again, as the Post Name structure is not working for me.
Hello,
Thank you for keeping in touch with us.
We might need to take a closer look at the settings. Please edit the first post on this ticket and include your WordPress login 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.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
Hello,
Thank you for keeping in touch with us.
I was able to replicate the issue but it seems the error is still occurring even all plugins are deactivated and the default theme is selected. Please see the video screencast in the Sensitive Data section.
This only tells us that the issue doesn’t come from any plugin or WordPress but from your server. Please contact your hosting provider.
Let us know how it goes. We are looking forward to hearing an update from you.
Thank you very much. I will resolve this with them. 🙂
Hello,
I would like to add, this could also be a .htaccess issue, you can take a backup of your .htaccess and delete the file over FTP. Head over to your WordPress permalink settings and re-save it. It should generate a standard .htaccess file and see if this resolves the issue.
Hope that helps and please do not hesitate to let us know if you need our assistance with anything else.
Thanks Jeremy! This is useful information. I thought it had something to do with the .htaccess file too.
Will access the server and find the issue. Thank you
Hello,
We are glad that we are able to address your issue. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.