Hello,
Thank you for reaching out to us.
The username of the account you opened this ticket with is witchscrumptiouslye3e2839eb6 with the email info@*****.***
We can help you change your username. To check if your preferred name is available, open your profile URL and try to change the name: https://support.rankmath.com/users/username1/
If changing username1 to [preferred nickname] shows a profile instead of a Page Not Found error, then it means the username is taken.
Please note that usernames can’t have spaces.
Kindly send us your preferred username or nickname and we will do the needful.
For the connection issue please head over to WordPress Dashboard > Settings > General and make sure there are no mismatches in the WordPress URL and Site URL in those options.
If you have different website URLs in there, that would explain the issue as they need to match for the connection to happen correctly.
To remedy that, you need to add a filter code to your website that will bypass the URL check when you connect your Rank Math account to your website. This might help if there is some issue with your server configuration or DNS settings.
To add the filter code, please follow this guide: https://rankmath.com/kb/wordpress-hooks-actions-filters/
Here’s the filter code you need to add to your website.:
add_filter( 'rank_math/registration/do_url_check', '__return_false' );
You can add it to your theme’s functions.php file or use a plugin like Code Snippets.
For more information on why this issue happens and how to fix it, you can check this page: https://rankmath.com/kb/problems-while-connecting-account/
Let us know how that goes. Looking forward to helping you.