Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
Could you please share the website where the Content AI is not working?
Meanwhile, please ensure that you’re using the latest version of Rank Math plugin on your site:
https://rankmath.com/changelog/free
Then follow these steps to fix the Content AI credits issue:
1 . Please clear the transients at Rank Math > Status & Tools > Database Tools > Remove transients

2 . After that, you may try disconnecting and re-connecting Rank Math to see if that works for you.
You can disconnect your account by navigating to WordPress Dashboard > Rank Math > Dashboard > Help and then simply disconnect the account by clicking on Disconnect Account.

3 . Once you’ve disconnected your Rank Math account, you can connect it again in the same settings. To connect your correct account, click on Connect Now.

4 . Once you click on Connect Now, please ensure that you’ve selected the correct account and then click on OK, Activate Now.

5 . Once all the above steps are done you might need to refresh the credits again this time to start using Content AI.
Please head over to WordPress Dashboard → Rank Math → General Settings → Content AI and refresh the credits. Here’s a screenshot for reference:

Let us know how this goes.
Hello,
This didn’t work. I think the problem persists because when I connect the website, it only asks to activate the SEO free plan and not Content AI.
The website is http://www.elainfaktat.fi
When I try to refresh the available credits, a prompt says – the response is not a valid JSON response.
Hello,
We have manually disconnected the website from our end. Now, please try to reconnect your website with your Rank Math account by navigating to WordPress Dashboard → Rank Math SEO → Dashboard → Help and then click on Connect Now.

Once you click on Connect Now, please ensure that you’ve selected the correct account and then click on OK, Activate Now, as shown below. In case you’ve multiple Rank Math licenses associated with your Rank Math account, then you can click the License drop-down to choose your preferred license to activate on this website.

Also, please make sure that you are running the latest version of Rank Math plugin.
Let us know if this fixes the issue.
Please do not hesitate to let us know if this doesn’t help or you have any follow-up queries.
Hello,
We’re delighted to hear that this issue has been resolved. We appreciate your feedback.
This ticket will be closed now, but if you ever have another question or need any help in the future, please don’t hesitate to create a new forum topic. We’ll be more than happy to assist you again.
Thank you for choosing Rank Math and have a wonderful day!