Hello,
We apologize for the issue you are facing with using AI on the free version of Rank Math. Thank you for raising this concern.
It seems like there might be a couple of reasons why the AI feature is not working for you:
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Content AI Credits: Ensure that you have refreshed your Content AI credits. You can do this by navigating to Rank Math SEO → General Settings → Content AI in your WordPress dashboard and refreshing the credits. Here’s a screenshot for reference:

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Account Connection: Since you mentioned that your account shows no sites connected on RankMath.com, it’s essential to connect your website to your Rank Math account. You can do this by logging into your Rank Math account and ensuring that your website is listed under the Websites section. If it’s not connected, please follow the steps to connect it.
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Activation: Make sure that Rank Math is activated properly on your site. You can check this by going to the activation page and confirming that the email matches the one linked to your account.

If you have checked all these points and are still experiencing issues, please reply to this ticket, and a human agent from the Rank Math Support team will assist you further.
We hope this helps, and we look forward to resolving this issue for you!
Sources:
How to Use Content AI for Free » Rank Math
How to Use Rank Math’s Content AI for SEO » Rank Math
I did activation via woocommerce plugin where can i find my details and logins
Hello,
Thank you for contacting Rank Math support, and sorry for any inconvenience that might have been caused due to that.
The error shows that you have yet to connect your website with your Rank Math account.
You can connect your account by navigating to WordPress Dashboard > Rank Math > Dashboard > Help and then simply disconnect the account by clicking on Connect Now button.

Hope this helps, and please do not hesitate to let us know if you need our assistance with anything else.
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.