You might have received a message saying The URL has been claimed at a higher level.
This happens when another Google Account has already claimed the top level domain. For example in the original account you have registered www.example.com, while in the new account you are trying to claim example.com. Notice that the new account we are trying to claim for a non www format.
Google considers www.example.com a higher level.
If you are 100% sure you want to claim your website in the new account you will need to claim the higher level, which is www.example.com (including www).
When you try and claim the same URL you will notice that Google is notifying you that another Merchant Account has already claimed this URL. You can now click on continue to verify the website under the new account.
Do note that your old account will have lost the claim on the website and all data feeds will stop working.