Hi
Might be a bug. But are you using Radius accounting to actively manage your sessions? If you don't then ISE cannot decrement the license counts quickly enough. Someone from Cisco mentioned somewhere that if ISE doens't get an Accounting Stop, then it will eventually release that license after 2 days or something like that. I wish I could find that in the user guide.
In theory, an increment in license usage should correlate to a successful authentication where you can see 'Base License consumed' message. And then it takes a while to reflect in the graph (it's not immediate). If the session then terminates on the NAS, an accounting stop should be sent to ISE. That will then decrement the license count by one. If you lost that accounting stop, then ISE will decrement the license count after some period of time (I think it's 2 days).
