How to activate a Twitch Gift Card key?

Activating a Twitch Gift Card key is really simple, just follow these steps:

1. Once you have your gift card visit twitch.tv/redeem and log into your Twitch account. 
2. Enter the code for your gift card and the amount will be automatically added to the Gift Card Balance in your Wallet.

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?