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Most Citi® card activation problems come from a typo in the details you entered. Re-enter your card number, security code, and personal information carefully, then try again.

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Other causes and fixes

Try a different activation method. If online activation isn’t working, activate by phone or in the Citi Mobile App.
Your card is ready to use. See After Activation.
Reset your user ID or password through the app’s sign-in screen, or activate online or by phone instead.
Contact Citi customer service using the number on your account statement or Citi.com to request a replacement.

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If that didn’t work

Call Citi customer service using the number on the back of your card. Have your card and identity details ready.
Be cautious of anyone who contacts you offering to “help activate” your card. Only share card details through official Citi channels.