Hello,
Thank you for your query, and we are so sorry about the trouble this must have caused.
Could you please setup the Rank Math analytics again to see if that triggers the plugin to generate the scheduled action.
Please try reconnecting Rank Math Analytics to your Google account once again from WordPress Dashboard > Rank Math > General Settings > Analytics.
Click on the red “Disconnect” link as per the screenshot below :

Once disconnected, refresh the page and head over to the same navigation again.
Click on the big blue color “Connect Google Services” button as per the screen shot below :

Please ensure that you select the correct Google Account and provide all the permissions while proceeding further.
If the above does not help, then this must due to the settings on the website if the DISABLE_WP_CRON
constant is set to true.
In order to fetch the analytics data automatically we rely on the WP-Cron and if it is disabled on your site it will not work.

Please ensure that the DISABLE_WP_CRON
constant is set to false in your wp-config.php
file.
You can also get in touch with your web host and ask them to enable the cron jobs.
Once done, please follow this guide to start a new data fetch and fix the issue: https://rankmath.com/kb/delete-old-analytics-data/
If that is already correct and the issue persist, we might need to take a closer look at the settings.
Please edit the first post on this ticket and include your WordPress & FTP logins in the designated Sensitive Data section.
Please do take a complete backup of your website before sharing the information with us.

It is completely secure and only our support staff has access to that section. If you want, you can use the below plugin to generate a temporary login URL to your website and share that with us instead:
https://wordpress.org/plugins/temporary-login-without-password/
You can use the above plugin in conjunction with the WP Security Audit Log to monitor what changes our staff might make on your website (if any):
https://wordpress.org/plugins/wp-security-audit-log/
We really look forward to helping you.
Thank you.