User bought one, or multiple, "Encryption Licenses" in addition to the "User Licenses" subscription for Symantec Endpoint Protection Cloud (SEPC).
1 user license = 5 device
1 encryption license = 5 encrypted devices
NOTE: the encryption management functionality is included with the User License subscription, and is not separate to the 5 devices included in the 1 user license.
Users should check what type of subscription they have purchased, either "User Licenses" or "Device Licenses".
This can be checked in the SEPC portal > Settings > Subscription