Hello,
We are extremely sorry about this issue but can you please verify if you have given the Rank Math App permission to read the Google Search Console data.

From here: https://myaccount.google.com/permissions
If not, please reconnect the Google Accounts, from your WordPress Dashboard > Rank Math > General Settings > Analytics

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.