Resolution

Log in to Admin Center as an Org Admin e.g. https://<customeridentifier>-admin.tylerportico.com/org/admin-center
Navigate to Workforce Identity from the left tool bar
Select Domains
Type the domain of the user to be added, hit ENTER button
Click Save
Click on Users on the left tool bar
Click + Add User
Enter the First Name, Last Name and Email Address of the user
Click Next
Assign any necessary groups to the user, or do not select any groups for just EERP Hub access
Click Next
Review the details and click Save & Close
The user will receive an email with instructions to activate their account and set their password

Browser not supported