Thanks for the reply, I had already found the square bracket as opposed to the brace, how embarrassing.
I do think there is a timing issue, the non-existent channel I inserted at your suggestion generates a "unable to join channel error"
The other valid channel produces the message "you need to be identified to a registered account to join this channel" after that there is a message Nickserv password accepted, you are now recognized.
It appears I am trying to join that channel before the server can recognize me.....
Any ideas?