Most of the time when I've had that issue, I have to go back and check every step ensuring that I don't have a typo, or that I've misspelled a property that I was supposed to add etc. One extra space, or a missing period in a regex, and the template won't show. If you've verified that you're using the correct version, and go back over it carefully, you'll probably catch the mistake. Another thing you may have to do is to get another helpx article that involves creating a template and page, (which most of them do), and follow the steps in it. Sometimes, specific helpx articles leave out CRITICAL steps, (e.g. adding a dialog so that sidekick will show up etc.), and if you only use one helpx article, you could spend days trouble-shooting. I've found it useful to just use another source to find out how to do the same thing you're trying to accomplish, and it will sometimes have the missing step included there, (sort of super-setting the instructions).
If all else fails and none of the prior suggestions work, take a working version of a template from another component that you've built, copy and paste it below the new component, and then go and change all of the names and properties etc. to match the article.
