HI Raja ,
-
"IF" there is a way to retrieve skills that are not associated with any agent, it will only be through an API.
But natively, without an API, you can find out which authorizations were used, including by using data filters such as today, yesterday, last 7 days, last 30 days, last 3 months, etc.
-
Analytics > Analytics Workspace > Skills Performance:
-

I hoje this help you
------------------------------
Kaio Oliveira
GCP - GCQM - GCS - GCA - GCD - GCO - GPE & GPR - GCWM
PS.: I apologize if there are any mistakes in my English; my primary language is Portuguese-Br.
------------------------------