PFManager can release entitlements that have been assigned to the host it is running on. Entitlements that have been assigned to another host must be released by a PFManager instance running on that host.
If an entitlement cannot be released from within PFManger, because the assigned machine is defective or no longer available, you can log into the PFAccount portal and blacklist the assigned host. This will release the entitlement from that host so you assign it to a new machine.
Please note: Blacklisting a host is final and cannot be undone if that machine becomes available again.