If you are signing up as an Operator for the first time you will need to input your email address for your venue account. (Help article on how to sign up as an Operator here)
If you see a message indicating that your domain is already taken as shown below, it means an operator or venue page has previously been created for it.
If you see this message please contact us so we can grant you access to those existing listings. Reach out to us at hello@tallyworkspace.com or via live chat, and we'll assist you promptly.