Scenario:
If you are running out of license seats, before purchasing new seats, you may want to first check if the seats aren't assigned to users who don't need them.

Resolution:
Use the License Seat Assignment report under Administration Reports to determine who is assigned which type of license seat.

If, there are users who don't require the specific license seats, you can either remove the Seat Assignment for that user, or disable the user to inactivate all seat assignments associated with that user. Those license seats would then be free to assign to other users.