Hello,
We apologize for the issue you are facing with the API access in Rank Math. It seems that you are unable to locate the "API Access" section, which is essential for managing your API key.
To resolve the "Invalid API key" error, please follow these steps:
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Check Rank Math Version: Ensure that you are using the latest version of Rank Math. You can update it by going to WordPress Dashboard → Plugins and clicking on Update Now if an update is available.

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Accessing API Settings: The API Access section should be found under Rank Math SEO → Instant Indexing → Settings. If you do not see this option, it may be due to a permissions issue or an incomplete installation of the plugin.
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User Permissions: Make sure you are logged in with an admin account, as only users with the appropriate permissions can access certain settings in Rank Math. If you have access to the Role Manager settings, check if your user role has the necessary capabilities.

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Reinstall Rank Math: If the above steps do not resolve the issue, consider reinstalling the Rank Math plugin. Sometimes, a fresh installation can fix missing settings or features.
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Bing API Key: If you are specifically looking for the Bing API Key, ensure that you have copied it correctly from your Bing Webmaster Tools account and pasted it into the appropriate field in Rank Math.

If you continue to experience difficulties after trying these steps, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further.
Thank you for raising this concern!
Sources:
Sorry, You Are Not Allowed to Access This Page » Rank Math
Resolving Content AI Related Issues » Rank Math
Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Rank Math doesn’t have any settings for the API Key. Can you please confirm where you see the Invalid API key error?
You can also share a screenshot with us by using a tool like https://imgur.com/upoload so that we can check this further for you.
Looking forward to helping you.
Thank 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.