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Hello @lryo,
Thank you for contacting support.
The correct way to whitelist the REST API routes in Cloudflare is by using the following method: https://rankmath.com/kb/whitelist-rank-math-in-cloudflare/
We would also recommend checking if you are using any other firewall or security plugin on your website that could be causing this and also checking if this is happening for a particular user role other than the administrator.
If you are using another security plugin on your website, you might need to whitelist the API routes of our plugin in that plugin for all user roles that should be able to modify it.
Don’t hesitate to get in touch if you have any other questions.