I can’t seem to PM the op. I have a code for Fantasy General up for grabs. PM me OP if it’s even worth it.
It is probably because your chat settings are set to Friends Only (GOG does this by default). You will need to go your acct - Orders and Settings - Privacy - and set your Chat to allow messages from everyone. Then you will be able to send and receive PMs to zeo and others. Hope that helps. :)
Edit: Oops - Ninja'd by a shadowy Grey. Hmm, I need to brush up on my X-com! ;)