Regain access to organization

When attempting to set up an organization for my workplace, I discovered that an organization with that name already exists. Since it’s a bit of an uncommon name, I suspect someone else in the company has previously created an organization and has since either left the company or forgotten all about it.

Is there any way to regain access or at the very least check whether the user who created the organization has an email address in the domain of the company?

The organization has no public information or repositories.