There are a few reasons why you may see Actions listed as "Unavailable in the App"...
The JouleBug platform is used to power many related apps, some for specific communities or organizations. The subscription package, which includes content choices, varies from one organization to another. And even within one organization, the available actions may vary from time to time in order to align with current initiatives.
Because the Feed and Leaderboard show historical activity, you may see others have logged Actions that are not currently available.
If the Actions have Mature Content (Drink Local or Pour a Pint), you must have your Facebook account connected and shared Basics Info so the app can see you're over 21 to Buzz them. (JouleBug only)
Seasonal Actions may relate to specific weather conditions or holidays, and are only available during the specific time periods of the year that align with their content.