Since Probely's web vulnerability scanner, tests your website for security issues and shows evidence and information about what vulnerabilities were found, and where. Thus, it is very likely that Probely will reveal some sensitive information. We don't want that information to fall into the hands of a person who isn't authorized to have it.
Simply, we want to make sure that you are allowed to run security tests on your targets domain. You can verify the ownership of your target using two methods: DNS records or a TXT file. If these validation methods work for you, you can also request help with the validation process.