Hello,
We apologize for the issue you are facing with Content AI in Rank Math. The error message you are encountering could be due to several reasons. Here are some steps you can take to troubleshoot the problem:
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Refresh Your Credits: Sometimes, you may need to refresh your Content AI credits. You can do this by going to your WordPress Dashboard → Rank Math → General Settings → Content AI and refreshing the credits. Here’s a screenshot for reference:

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Check Your Subscription: Ensure that you have an active Content AI subscription. If not, you will see a message indicating that you need an active plan. You can select a plan here.

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Connect Your Rank Math Account: Make sure your website is connected to your Rank Math account. If it’s not connected, you will see a message prompting you to connect. Click on the Connect Now button to log in.

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Check for Updates: Ensure that Rank Math is updated to the latest version, as outdated versions may cause issues.
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Exhausted Credits: If you have reached your Content AI credits limit for the domain, you will need to allocate more credits. You can do this by logging into your Rank Math account and adjusting the limits in the Client Management Dashboard.

If the issue persists 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:
Resolving Content AI Related Issues » Rank Math
Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
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.
The feature of free Content AI credit is limited to AI generation using AI tools and AI generation inside the editor.
Content AI Research, Editing Bulk SEO Meta, and Multiple Sessions in RankBot will not work for users without a separate plan.
You can read more about this from here: https://rankmath.com/kb/content-ai-free/
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,
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.