Hello,
Thank you for reaching out to us. We’re sorry to hear that you’re facing issues with Content AI in WordPress.
To resolve this, please head over to your WordPress Dashboard → Rank Math → General Settings → Content AI and refresh the credits. Here’s a screenshot for reference:

Once done, please go back to using Content AI, and it should work without any issues.
If you encounter any further issues or need additional assistance, please don’t hesitate to let us know.
Sources:
Content AI Overview » Rank Math
How to Use Content AI in Block Editor » Rank Math
How to Restore Missing Content AI Credits » Rank Math
My content ai is not working in WordPress and it showing active.
Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Could you please try to follow the steps from this guideline and see if that works for you? https://rankmath.com/kb/how-to-restore-missing-content-ai-credits/
If the issue persists, please head over to your Rank Math Account > Website or visit this URL: https://rankmath.com/my-account/websites/ and share a screenshot with us by using a tool like https://imgur.com/upload so that we can check the issue further for you.
Let us know how it goes. 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.