Can't log in to app and says verification failed when I enter last 4 digits of card in "Forgot" option


I got a new card and downloaded the app but can’t enter. It asks for a 4 digit passcode I don’t know, then when I click “Forgot” and enter my phone number and last 4 digits of card number, it says “Verification Failed. Please ensure you entered the correct value.” I don’t know what else to do. Can anyone help? I’m off to China tonight and was hoping to use my card there! Thanks in advance.