If you can’t do a balance transfer on your Citi card, it might be due to several reasons. You could have already reached your credit limit or your card might not be eligible for balance transfers. Some promotional balance transfer offers are only available for a limited time after opening the account. Also, if your account is not in good standing, Citi may restrict certain features, including balance transfers. Check your account status and terms of your card. If you’re unsure, contact Citi customer service for specific details and assistance.