Hello,
Thank you for reaching out to us. We apologize for the inconvenience you are experiencing with your Content AI credits.
It seems like there might be an issue with the credits. To resolve this, please head over to WordPress Dashboard → Rank Math → General Settings → Content AI and refresh the credits. Here’s a screenshot for reference:

After refreshing the credits, please try using Content AI again. If the issue persists, please don’t hesitate to let us know so we can further assist you.
We appreciate your patience and understanding.
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.