Unable to create a new workspace for a client

[rajkopodinic]

Im trying to create a new Google Workspace for a client.

I go through all the steps but get stuck where is asks me to create the username.
example: info@example.com (It says that "info" is already taken)

After asking my client if they created a Google account using this email in the past they say no. I try to login to this email but Google says that this account does not exist?

Any idea how I can reset Google Workspace to remove anything associated with account creation of this email before? Have tried logging into all google services with the email but unable to as "Account does not exist" message shows.