Hello,
Thank you for reaching out to us. I’m sorry to hear about the issue you are facing with the setup of the AI Analyzer.
To assist you with the setup, please head over to your WordPress Dashboard → Rank Math → General Settings → Content AI and refresh the credits. Here’s a screenshot for reference:

Once you have refreshed the credits, you should be able to use the AI Analyzer without any issues.
If you need further assistance or have any other questions, please feel free to let us know. We’re here to help!
Sources:
How to Write Emails That Wow Your Readers » Rank Math
How to Write Smart & Effective Email Reply » Rank Math
This is an automated reply from Rank Math Support Bot. If you need further assistance, please reply to this topic and a human support agent will reply to you shortly.
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.