Question
How can I add agent seats to my account? How do I buy additional agent seats?
Answer
Account owners and billing admins can purchase additional agents seats as needed. Admins who aren't the account owner or a billing admin can request a subscription change to add agent seats.
The ability to add agent seats depends on your account type. For sales-assisted accounts that can't instantly buy agent seats, you'll see a form to request more agents. The request is sent to your sales representative and a service order will be created on your behalf.
See the video below for a guide on how to add agent seats to your Zendesk account.
For more information, see the article: Adding agent seats to your subscription.