Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to that.
You can easily check your Google Account connection by using the Test Connections button in WordPress Dashboard > Rank Math > General Settings > Analytics:

If you see the dots green that means it is properly connected but if the dots become red then you’ll have to reconnect your Google account again by following the steps here: https://rankmath.com/kb/analytics-issues/#expired-google-oauth-token
However, if the connection is okay but you’re still not able to see any data on your Google Analytics then please try to follow the steps below to create a troubleshooting log so that we can check the issue further for you.
1. At first add the following filter to your website:
add_filter( 'rank_math/analytics/log_response', '__return_true' );
Here is a guide you can follow to add the filter:
https://rankmath.com/kb/wordpress-hooks-actions-filters/
2. After adding the filter, please run the pending Scheduled Action from your 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
This is how it should look like:

When some actions have completed running, please check the Analytics log under wp-content/uploads/rank-math
and share that with us. You can upload the log file using this tool.
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.