Hello,
Thank you for your query and we are so sorry about the trouble this must have caused.
Please follow these steps:
1. Please delete RankMath’s app from here:
https://myaccount.google.com/permissions

2. Reconnect the account inside Rank Math by clicking here and ensure that you approve all the permission notices that show up:
WP Dashboard >> Rank Math >> General Settings >> Analytics tab, and click the Reconnect
link

Allow all the permissions on the next screen.

If the issue persists, Please add the email of our developer to your website’s Search Console: m*******@r***********
This way he could debug the connection and fully understand what is causing the issue.
You can follow this guide to add a user in the Search Console:
https://rankmath.com/kb/add-user-to-google-search-console/
Looking forward to helping you.Hello,
Please follow these steps:
1. Please delete RankMath’s app from here:
https://myaccount.google.com/permissions

2. Reconnect the account inside Rank Math by clicking here and ensure that you approve all the permission notices that show up:
WP Dashboard >> Rank Math >> General Settings >> Analytics tab, and click the Reconnect
link

Allow all the permissions on the next screen.

Hope that helps and please do not hesitate to let us know if you need my assistance with anything else.