This domain name is already in use

[EpsilonWebDev]

I have a Google Enterprise ReCaptcha account

I am trying to setup a Organization for a new Workspace but when I put in my domain it says:

"This domain name is already in use. If you own this domain and would like to use Google Workspace, please follow the steps here"

I am not sure who used my company domain, I am with Web support implementing recaptcha for the company, how do I find out the owner email who set the Workspace up for "epsilon.com"?

Are there tools that help find out the email owner so I can reach out to use this Workspace account?