Codes can be redeemed at https://aka.ms/GAB18 until they expire.
Each pass can be redeemed until the expiration date.
Once redeemed, each pass is valid for $100 in Azure credit per month for three months.
How to Redeem Passes:
Go to https://aka.ms/GAB18
Enter the redemption code
Sign in with your Microsoft Account, or create one free (code can NOT be applied to an account that is already using Azure)
Have more questions? Check out the troubleshooting page at https://www.microsoftazurepass.com/Home/HowTo