The watermark should appear on photo shared from the Share icon in the Lightroom CC iOs app. So, Text, Email, Facebook, Instagram etc should see watermarks. I do not believe that web galleries created using the http://lightroom.adobe.com functionality yet support watermarks.
Thanks Rikk - I really appreciate your response and advice.
Yes - you are absolutely correct, sharing individual photos will result in the watermark but web galleries do not have the watermark. This is a shame and I hope that Adobe will include this in the next upgrade.