Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
We have separated your concern into a new ticket so we can assist you accordingly.
Could you please share your website URL so we can check it as well?
Meanwhile, please get in touch with your web host and ensure that the ModSecurity
(ModSec) is disabled or they are not blocking any process of the plugin.
You can also ask them to whitelist Rank Math’s routes for saving:
/wp-json/rankmath/v1/updateMeta
/wp-json/rankmath/v1/saveModule
Let us know how this goes.
Thank you.