When you create a new app on Facebook, the 'Sandbox' mode is activated by default. This way, only the app and fan page administrators will be able to access the promotion.
You need to deactivate the Sandbox mode. Please, follow these instructions:
2. Step by step.
- Go to https://developers.facebook.com/
- Click on "Apps" and select the app you are working in.
Click "Show" on Dashboard, where you'll see the App ID and the App Secret . To desactivate the Sandbox mode, you need to fill out the field "Contact email" on "Settings".
- In the upper-right corner, you can activate it, as shown in the picture below:
A message will appear "Do you want to make the public application?" and you will have to choose a category of this new application. We will select the option Business & Pages.
Facebook won't allow us to do it automatically :-(