Question
Why can't I add new agents and admins?
Answer
As an account administrator, you have the ability and permissions to add new agents and admins. Your account subscription has a specific amount of paid user seats to be used. When agents and admins of the account have filled those seats, you will be blocked from adding a new user. You will be notified of the lack of user seats when you receive an error while trying to add a new agent or admin. As an administrator, you can check out how many counted seats you have within the Admin Center. The account owner will need to purchase additional licenses for the new users.
For more information, see the article: Adding agent seats to your subscription.