I Just bought six of these. I'm stoked - this is precisely what I've been waiting for for my family. I actually discovered I was lactose intolerant (after 30+ years) through 23andme - somehow that little detail got by me... :-)
I think you mean to say that you discovered that you have an increased chance of being lactose intolerant through 23andme, they do not tell you that you are lactose intolerant. It may have been something that you found external confirmation for, but 23andme deals in probabilities, as far as I understand the process.
To be precise, their report said:
"Likely to be lactose intolerant due to lack of the lactase enzyme as an adult. Unable to drink more than a glass of milk a day due to lower adult lactase enzyme levels. (May still be lactose tolerant for environmental reasons.)"