Hello,
Thank you for contacting the support, and sorry for any inconvenience that might have been caused due to that.
I was able to replicate the issue and I noticed your website is blocking access to a file which leads to a 403 error. It may have to do with your security plugin or server-related security software. https://rankmath.com/kb/meta-data-not-saving/#firewall
The file: /wp-json/rankmath/v1/updateMeta?_locale=user
Please refer to my screenshot: https://i.rankmath.com/tngN1L
Could you please contact your hosting provider and see if they are able to whitelist this file if possible?
We are looking forward to helping 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.