There are a number of reasons why the texting isn't working. Below is a list of the various reasons.
1. Check that you are using the shortcode 26971. It's easy to get the numbers mixed up.
2. Check the spelling of your keyword. It's easy to mix up TY8L with T8YL.
3. If you have a signature in your text messaging, then the system might not work.
4. You might have a cellular network that blocks certain shortcodes. Check with your carrier to see if this is the problem. But only check with them after you've checked the first 3 issues above a number of times.
Hope this helps!