Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
Please try reconnecting your Google account. Remove RankMath’s app from your Google apps permissions: https://myaccount.google.com/permissions
Then, head over to your WordPress Dashboard > Rank Math > General Settings > Analytics and reconnect the Google service and this time, ensure that all permissions are checked:


Then, please head over to WordPress dashboard > Tools > Scheduled Actions > Pending.
or you can try visiting the following URL:
https://yourdomain.com/wp-admin/tools.php?page=action-scheduler&status=pending
Run the rank_math/analytics/data_fetch scheduled action once more and wait for the data fetch to complete.
This is how it should look like: 
After that, please allow Rank Math a while to fetch data from Google Analytics and you should be able to see the updated data on Rank Matha Analytics dashboard.
If the issue persists, let us know here and we will be happy to further investigate this for you.
We are looking forward to helping 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.