Hello,
Thank you for contacting Rank Math for help with an undefined error in the instant indexing tool.
The login credentials you shared have limited access. do you mind increasing the user level so we can check the instant indexing settings.
In the meantime, please click “Show raw response under the “Error Undefined” to see details about the error. If you see a status: 500, it means there is a misconfiguration in your instant indexing setup and you need to redo it. If you have a different error, please share a screenshot similar to the one below so we can check:

Hope that helps. Please let us know if you have questions.
Hello,
I have updated the sensitive data as requested. Can you please check further?
Thank you.
I have updated the wp-admin details. Kindly check now. I am getting an undefined error. I use some Console API file for other projects and working fine. BUt not working on this site.I tried all possible solutions and other tickets.
Hello,
5xx errors are usually caused due to server misconfiguration or other server issues.
Can you please share the website error log with us?
Having the error log file will give a clear idea of why this might be happening. Please enable debugging on your site, replicate the issue once again and share the error log with us here.
You can follow this guide to enable debugging in WordPress
https://wordpress.org/support/article/debugging-in-wordpress/ or you can get in touch with your web host, they will help you locate the log file.
Looking forward to helping 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.