There is no specific way to "claim" Amazon Roblox. However, if you are the rightful owner of an Amazon Roblox account, you can follow these steps to verify your ownership and regain access to your account:
Visit the Amazon Roblox website and click on the "Help" link at the bottom of the page.
Click on the "Need help? Contact us" link.
Select the "I need help with something else" option.
Enter your Amazon Roblox account email address and click on the "Continue" button.
Follow the instructions on the next page to verify your ownership and regain access to your account.