When a unique user submits a paper, we count them as an active user in your license. These are shown as Seats used within your account. The number of seats used shown in your license reflects the number of unique users that have made a submission to Turnitin during your license period.
When accessing Turnitin via an integration, a user is only counted as a seat on your license once they make a submission. This means that you may have active users on your LMS, but if they have not submitted a paper through Turnitin yet, they will not be counted as a seat on your license.
If a user is deleted, they will also be removed from the seat count.
Information on where you can check how many seats are currently in use on your account can be found here.
If you'd like to discuss your license in more detail, please reach out to your account manager or customer success manager.