Hello,
Thanks for contacting us, and sorry for any inconvenience that might have been caused due to that.
It seems that you’re currently using the Rank Math PRO plugin, but the account you have used to open this ticket is the Rank Math free version.
Can you please search and forward a receipt from FastSpring.com so we can locate your account and verify it?
Back to your issue, please make sure you’ve connected Rank Math with your correct Google account. If so, then I would like to request you to re-connect your Google account with Rank Math by following the steps I’ve mentioned below, without skipping them.
#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 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 ~ Setup
Once the above process is done, please follow the URL below to setup Rank Math Analytics properly:
https://rankmath.com/kb/connect-your-google-account/#num-3-connect-to-search-console
Let us know how that goes. Looking forward to helping you.
Thank you.