Okta Admin may run into the following error when creating a new user account:

An object with this field already exists in the current organization.

• Administration

• The Okta username must be unique. 
• While the email address does not have to be unique, the email address attribute cannot match the Okta username of another user.
• The option Value must be unique for each user is enabled for a specific attribute (available for all other attributes apart from the username).

• Use an email address that does not match the Okta username of another user, or change the Okta username to remove the conflict.
• Navigate to Okta Admin Console >  Directory > Profile Editor > User (default). Search for the desired attribute and click on the i sign. A pop-up will open from where the Value must be unique for each user option can be turned off (See print screen in the Cause section).

NOTE: There is a feature flag that can be disabled to allow users to be created with the same email/username. Please reach out to Okta Support for more information if necessary.