/chanserv invite (channel) (nick)
NOTE: you do not need to use parentheses.
/chanserv invite #dragonrealm Morpher
You will receive this notice from ChanServ if this command is completed successfully:
-ChanServ- Morpher has been invited to #dragonrealm
Morpher would see:
*** ChanServ (firstname.lastname@example.org) invites you to #DragonRealm
Either Morpher changed his nick or he is no longer logged on.
The channel may indeed be registered - don't panic. All this means is that no one is on it right now, so at present, ChanServ thinks it doesn't exist. (Tip: make sure you have your channel spelled right!)