A: The app directory has a My region filter that is on by default. It only shows apps where your account's region is one of the app's regions, so an app you created without a region does not appear.
To show your app, go to Settings → App directory, click your app under Your apps, select your account's region under Region and save the app. You can also uncheck My region in the app directory to see apps from all regions.
Your account's region is set under Settings → Account → Account settings → Region.