What is the use of ClearPass access,Onbaord, Onguard license?Aruba ClearPass - Licensing Explained 

The Access license is used to enable 802.1X, MAC Authentication, TACACS+, Guest, OnConnect, Security Exchange (previously ClearPass Exchange) and Endpoint Profiling. Access license consumption is based upon a concurrent session per-endpoint model.
Licensing requirements and procedures vary slightly between ClearPass virtual appliances and ClearPass hardware appliances. .
HPE Aruba ClearPass New Licensing Access
Aruba ClearPass - Licensing Explained
How do I check my ClearPass license?
Aruba ClearPass New Licensing OnGuard