I was supposed to register EMC powerpath in one of the servers and I did not have an proper idea to do so. I did not have the key with myself.
Then after a lots of googling I found the command to check the EMC powerpath registration status.
There are no license keys now registered.
Then I logged into another server, executed the same command and got the key.
I then used the same key for the server using the command.
C:\Users\administrator>emcpreg -add XXXX-XXXX-XXXX-XXXX-XXXX-XXXX
Success: License added
I succeeded in registration.