If the system tells you that the email address you're trying to add has already been taken, that means that the email address is in your account as either an Active or Archived user.
Kudos identifies users by their email addresses, and while users can be in more than one organization's account with the same email address, the same email address cannot be used twice within the same account. Even if a user is archived, their email address cannot be used again to add a new user.
To solve this problem go to:
> User Admin > Users
Then do the following:
Click in the search field to open up the filters. Click the first menu to change the "Active Users" filter to "Archived & Active".
Type in the user's name in the search field and select the correct name from the list that will auto-populate*.
"Activate" that user. You're now able to edit the user's information in any way.
*If you do not know the name that's associated with that email address, you must download the CSV with your current users and find that email address in your downloaded CSV. Under "Users" click on the Bulk Changes button. On the next screen click the button to download EXISTING USER DATA. Once downloaded, look up the user by the email address to find out what their name is. Remember that you CANNOT change email addresses using the bulk download and upload feature.
We hope this helps! If you have any questions, please post a comment below and one of our friendly team members will be happy to assist you.