I have this same issue. I know I have positively been sent invites from three different CCs but never received a email, not in spam, trash or inbox. I do have the ok to contact me box checked in account settings. I also do receive everything else,or so I think, from WGT ie. tourney entries and product spam, with no issues.
Contacted WGT tech support via email and asked for help or a workaround and they weren't much help. Has anyone else had this issue and figured out how to solve it?