If a Bluebird by American Express card is lost or stolen, it is important to take immediate action to protect the account and any associated funds. First, one should log in to their Bluebird online account or mobile app if available. Within the account, there is typically an option to report the card as lost or stolen, which will help to temporarily freeze the account and prevent unauthorized transactions. Once the card is reported, it is advisable to review recent transactions for any unauthorized activity. Also, contacting customer service may provide additional assistance. To ensure a replacement card is issued promptly, users should follow any instructions provided during the reporting process. It is good practice to check the Bluebird website for specific guidance and contact information, as they can provide further support in these situations.