Error: BLZBNTGFT00000001

This error typically indicates you are trying to claim a gift for a game that is not on your Battle.net Account. Once you have purchased the required game for this account, you should be able to claim the gift.

If the previous troubleshooting info didn't resolve the problem, you can ask the Blizzard player community for help on the tech support forums (if available) or other community gaming sites. Local computer or network technicians may also be able to help if you've exhausted all other resources.