Hello,
Thank you for contacting Rank Math and bringing your concern to our attention. I’m sorry for any inconvenience this issue may have caused you.
Could you please confirm if you have already created a GA4 property for your website?
If not yet, please visit this page (https://analytics.google.com/analytics/web/) and sign up for a Google Analytics account and property, then reconnect your Google Account so the new Analytics account will reflect in that section.
Hope that helps.
Hello,
Please follow these steps:
1) Remove Rank Math’s access from Google Please remove RankMath’s app from your Google apps permissions: https://myaccount.google.com/permissions

2) Re-connect to regenerate the auth token from Google
After that, reconnect the Google account again to regenerate the auth token from Google, by going to WordPress Dashboard > Rank Math > General Settings > Analytics and configure the Search Console and Analytics settings again:

3) Grant all necessary permissions
Kindly check all necessary checkboxes to allow Rank Math to access some of the Google Services. Please check my screenshot below for reference:

4) Follow the instructions to sign in with your Google account and allow Rank Math to access your data. https://rankmath.com/kb/connect-your-google-account/
You can also refer to this guide for more details: https://rankmath.com/kb/analytics-issues/#expired-google-oauth-token
We hope this resolves the issue for you. 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.