As an end user, you cannot create Enterprise IDs. Enterprise IDs are created, owned, and managed by your organization. If you do not have an Enterprise ID, contact your IT administrator. For more details, see this document.
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User identities are verified against an authentication source. To use Enterprise ID or Federated ID, set up your own authentication source by adding a domain. For example, if your email address is email@example.com, example.com is your domain.
Adding a domain permits the creation of Enterprise IDs or Federated IDs with email addresses on the domain. A domain can be used either with Enterprise IDs or Federated IDs, but not both. You can, however, add multiple domains.
An organization must validate their control over a domain. An organization can also add multiple domains. However, a domain can be added only once. Known public and generic domains, such as gmail.com or yahoo.com cannot be added at all.