Hello,
We apologize for the issue you are facing with the Search Intent feature showing an "INVALID API KEY" error. This error typically occurs when the API key has not been copied and pasted correctly or if it has been regenerated after configuring the Bing URL Submission API with Rank Math.
To resolve this issue, please follow these steps:
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Get the Correct API Key: Go to your Bing Webmaster Tools account and navigate to Settings → API Access → API Key. Click the Copy button to copy your API key.

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Add the API Key in Rank Math: In your WordPress admin area, go to Rank Math SEO → Instant Indexing. Under the Settings tab, paste the Bing API Key you copied earlier and click the Save Changes button.

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Avoid Regenerating the API Key: After configuring the settings, make sure not to regenerate the API key in your Bing Webmaster Tools, as this will invalidate the existing key.
Once you have updated the API key, try using the Search Intent feature again. If you continue to experience issues, please reply to this ticket, and a human agent from our support team will assist you further.
Thank you for raising this concern!
Sources:
How to Fix Failed to Submit Post to the Bing URL Submission API Error » Rank Math
There is no such page where I can paste the Bing API key
Hello,
The Search Intent feature is only available using Rank Math PRO, but the account you have used to open this ticket is the Rank Math free version.
Can you please search and forward a receipt from FastSpring.com or the email address you used to purchase so we can locate your account and verify it?
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.