Hello,
Thank you for contacting Rank Math and sorry for any inconvenience that might have caused.
Please note that Rank Math does not support domain property verification in Google Search Console (sc-domain:yourdomain.com)
You may need to reconnect your website to https:// version and ensure that you approve all the permission notices that show up:
Please navigate to WP Dashboard > Rank Math > General Settings > Analytics tab, and click the Reconnect
link as shown below

Allow all the permissions on the next screen

This should fix the issue and the index status tab should be populated with data
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.