Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have been caused due to that.
Those errors usually are caused when something is blocking access to the WordPress REST API.
This could also suggest that there is a conflict between Rank Math and one of your installed plugins which might be having the WordPress REST API disabled. To determine that, please follow this troubleshooting guide:
https://rankmath.com/kb/check-plugin-conflicts/
Please try activating only Rank Math and a default theme and see if the issue persists.
If that didn’t help, please contact your web host and ask if your server is blocking it, firewall policies, or even a security plugin.
I hope that helps. Thank you, and looking forward to your update.
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.