The default usage of a key is 1. This can be changed in different ways.
When a key is created using the Activation Server Administration Interface, the maximum Key usage can be defined. You also have to check the option: Store key in Activation Server
In case a key was already created but never used, you can add this key on the Activation Server.
Select: Add a Key on the Activation Server , add the key and define the maximum Key / ID usage
If a key was already used, you search for the key and modify it (TAB Manage Activations, Key List or Activation Requests)
This is a configuration option of the project - see Activation Server.
If a Serial Number is used again on the same PC, it does not count as a new key usage.