Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
Please head over to your WordPress Dashboard > Rank Math > Dashboard > Help, and from there disconnect and reconnect your Rank Math account and see if that helps to resolve the issue.
https://i.rankmath.com/ZvEfVb
https://i.rankmath.com/OZSwOw
Once done, please try to refresh the credits from WordPress Dashboard > Rank Math > General Settings > Content AI and see if that works for you. Here’s a screenshot for reference:

For more information on why this issue happens and how to fix it, you can check this page:
https://rankmath.com/kb/how-to-restore-missing-content-ai-credits/
Hope this helps, and please do not hesitate to let us know if you need our assistance with anything else.
Thank you for choosing Rank Math.
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.