Please find output of show ap license-usage command
Master before failover
(master) #show ap license-usage
AP Licenses
-----------
Type Number
---- ------
AP Licenses 826
PEF Licenses 940
Overall AP License Limit 826
AP Usage
--------
Type Count
---- -----
Active CAPs 736
Standby CAPs 0
RAPs 0
Remote-node APs 0
Tunneled nodes 0
Total APs 736
Remaining AP Capacity
---------------------
Type Number
---- ------
CAPs 90
RAPs 90
Backup before failover
(backup#show ap license-usage
AP Licenses
-----------
Type Number
---- ------
AP Licenses 90
PEF Licenses 204
Overall AP License Limit 90
AP Usage
--------
Type Count
---- -----
Active CAPs 0
Standby CAPs 0
RAPs 0
Remote-node APs 0
Tunneled nodes 0
Total APs 0
Remaining AP Capacity
---------------------
Type Number
---- ------
CAPs 90
RAPs 90
Backup after failover
(backup) #show ap license-usage
AP Licenses
-----------
Type Number
---- ------
AP Licenses 1561
PEF Licenses 1143
Overall AP License Limit 1143
AP Usage
--------
Type Count
---- -----
Active CAPs 737
Standby CAPs 0
RAPs 0
Remote-node APs 0
Tunneled nodes 0
Total APs 737
Remaining AP Capacity
---------------------
Type Number
---- ------
CAPs 406
RAPs 406