How to activate an XBOX360 key?

Activating an XBOX360 key is really simple, just follow those steps:

1. Go to https://www.xbox.com
2. Login to your account
3. Hover over your account link (the top right of the screen) a menu will appear, click on the "Redeem Code" button.
4. On the next page, click "Redeem"
5. Enter your code
6. Click "Confirm"
7. Click "Confirm" again to assign the key to your account.

The key is not working

If you have activated the key according to the guide but the code appears not to work, please check what type of error message you receive and depending on it follow the appropriate instructions:

• My key is Duplicated / Already Used. How can I proceed?
• My key is Invalid. How can I proceed?
• My key is region locked / can't be activated in my country. How can I proceed?
• My key activated a different product that it was supposed to. How can I proceed?
• The key I bought didn’t activate all of the content it was supposed to. What can I do?