I'm having trouble signing up for Workplace.
You can only create a Workplace account using a private email domain belonging to a specific individual. Keep in mind the email domain can't have already been claimed by another Workplace community.
You can't sign up for Workplace using a public email domain, such as gmail.com and yahoo.com, etc. You also can't sign up for Workplace using a generic email address, such as info@, admin@, sales@, etc.