Hello,
Thank you for contacting Rank Math, and sorry for any inconvenience caused.
The 400 status code indicates that the server was unable to process the request sent.
However, as an initial troubleshooting step, we’ve seen a case in the past where this was related to compatibility between W3 Total Cache plugin and the hosting. Here’s the thread link: https://support.rankmath.com/ticket/instant-indexing-error-undefined-4/
Could you confirm if you’re using the W3 Total Cache plugin? If yes, please try temporarily disabling it and see if it helps.
In any case, please ensure that the admin area of the website is not getting cached by any caching plugin on the website or the server.
You can also get in touch with your web host regarding this and see if they have further insights into the error.
Looking forward to hearing back from you.
Thank you.
Hello,
Since we did not hear back from you for 15 days, we are assuming that you found the solution. We are closing this support ticket.
If you still need assistance or any other help, please feel free to open a new support ticket, and we will be more than happy to assist.
Thank you.
