How can I determine who takes up an agent seat in my account?
Suspended agents take up a seat. To free up the seat, Zendesk recommends downgrading agents first before suspending their accounts.
Light agents who are also Chat agents also take up an agent seat. For example, an account on Zendesk Suite has five agent seats. If the account has one admin, three agents, and ten light agents, we would think that they have one available agent seat. However, one of the ten light agents is also a Chat agent. This takes up the final agent seat, so the account cannot add any additional agents.