Thank you for contacting Rank Math, and sorry for any inconvenience caused.
Please check if you are using a Firewall, as there are chances that it will prevent saving the data.
If you are using a Firewall, please whitelist this route:
/wp-json/rankmath/v1/updateMeta
Whitelisting the route should fix the issue.
You can check this link for more information:
https://rankmath.com/kb/meta-data-not-saving/#firewall
I hope this helps. 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.
