I have issue with my rank math activation

Subject: Issue with Rank Math Metadata Not Appearing in REST API

Hello,

We have been trying to fix an issue where Rank Math fields (rank_math_focus_keyword, rank_math_description) are not appearing in the WordPress REST API response (/wp-json/wp/v2/posts).

Steps we tried:

1. Added custom PHP code using rest_prepare_post to include the Rank Math fields.

2. Cleared all website caches (plugin cache + server cache + CDN).

3. Disabled and re-enabled relevant plugins to ensure no conflicts.

4. Checked the JSON output directly — the Rank Math fields are still missing.

It seems the code is not being executed or is being overridden before the API response is sent.
Could you please check if there is any server-side or configuration issue that might block these custom fields from appearing in the API?

Thank you,

Subject: Rank Math Meta Data Not Showing in WP REST API

Summary of the issue:
We are trying to retrieve Rank Math SEO meta data (focus keyword, SEO score, description, etc.) through the WordPress REST API endpoint /wp-json/wp/v2/posts/{id} so we can use it in an external application.
However, the REST API only returns the default WordPress post data (title, content, date, etc.) — the Rank Math meta fields are missing.

What we tried today:

1. Enabled the Rank Math REST API Module

Checked Rank Math settings to ensure the REST API module is active.

Tested /wp-json/rankmath/v1/get-meta/?id={post_id} but the endpoint either returns nothing or is inaccessible.

2. Custom Code to Inject Rank Math Meta into WP REST API

Added multiple code snippets in functions.php to hook into rest_api_init and register_rest_field to append Rank Math meta fields into the wp/v2/posts endpoint.

Verified the code syntax and placement.

3. Cache Clearing

Cleared all caches from Cloudflare and WordPress cache plugins.

Retested the REST API from different browsers and devices.

4. Testing

Called /wp-json/wp/v2/posts/{id} from a fresh browser and still only see standard post fields (no Rank Math fields).

Example output:

Title, date, slug, link are returned.

Rank Math meta data is not returned.

Current Status:
Despite enabling the Rank Math REST API module and adding custom code, the Rank Math meta fields do not appear in the REST API response. We need guidance on how to reliably retrieve Rank Math SEO data for posts through the REST API.

Request:
Please advise if there is an official or recommended method to fetch Rank Math SEO meta data through the REST API, or if any additional settings/code are required to make this possible.

Good morning 🌅

message that appears is:
“No route was found that matches the URL and request method.”
To troubleshoot this, I have already performed the following steps on my end:
* I have re-saved my WordPress permalinks in Settings > Permalinks.
* I have cleared all caches (both from my site and on the server level).
* I have temporarily deactivated all security plugins to rule out any conflicts.

Since these steps did not resolve the issue, I suspect that the REST API requests might be blocked at the server level by a firewall (such as ModSecurity) or another server-side security rule.

So I contact my hosting support to
investigate if there are any server-level configurations or firewalls that might be interfering with the REST API functionality on my site?

If my steps are correct, please confirm
Thanks for your help

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