Hmmmmm... still not good - since DS below is also on gmail, so suggests something about the confirmo email may be tripping spam filter at common setting, but at least may solve mystery.
Trying again on off-chance a certain setting was interfering.
Thanks doubly, DS. If the feature is working correctly, you should have received a confirmation email, its links should work, and, if you've already confirmed and have gone with the default ("Replies to my comments"), you should be getting an email with this comment.
You're welcome and will do, Joe Sal - or anyway that's the hopeplan.