Hello,
We’re sorry to hear that you’re experiencing issues connecting Google services to your website. It’s possible that the issue might be related to the secondary domain setup. To resolve this, you can check the configured domain name in the Google Analytics account and ensure that the domain name matches the actual site where you’re fetching Analytics data.
To do this, you can identify the Google Analytics property your Rank Math Analytics is connected with and head over to Admin → Property → Property Settings in the Google Analytics account. Here, in the Default URL, ensure that the domain name is the same as that of the actual site where you’re fetching Analytics data.
If the issue persists even after ensuring that the domain name is correctly configured, please open a support ticket here and share the error log with us. We’ll be happy to assist you further.
Thank you for reaching out to us!
Sources:
Resolving Rank Math Analytics Related Issues » Rank Math
How to Find Out Where 404 Errors Are Coming From » Rank Math
How to Install Google Analytics With Rank Math SEO » Rank Math
Hello,
Thank you for contacting us and sorry for any inconvenience that might have been caused due to this issue.
Can you please confirm if you have a verified Google Search Console and Google Analytics property on the Google account you connected? Please double-check that the Google account you connected has a functional Google Search Console and Google Analytics property. If you do not have a Google Search Console property, you can create one by following this guide. You can also sign up for Google Analytics here.
Looking forward to helping you resolve this issue.
I have my domain all set. Now I’m trying to add a property to the analytics, but the drop down menu is blank and I’m not seeing “add a property”
Hello,
Please delete RankMath’s app from your Google Apps permissions:
https://myaccount.google.com/permissions

After that, reconnect the Google account, 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:

Ensure that all necessary permissions are accepted.
After doing so, let us know so we can move forward with debugging the issue.
We are looking forward to helping you on this one.
I ended up watching your youtube video and it had the same steps as above and it worked! Ty!
Hello,
We are super happy that this resolved your issue. If you have any other questions in the future, know that we are here to help you.
If you don’t mind me asking, could you please leave us a review (if you haven’t already) on https://wordpress.org/support/plugin/seo-by-rank-math/reviews/#new-post about your overall experience with Rank Math? We appreciate your time and patience.
If you do have another question in the future, please feel free to create a new forum topic, and it will be our pleasure to assist you again.
Thank you.