Once your card is issued, you will receive your Star Alliance ID via an email from Star Alliance Rewards. You can then use this ID to complete your registration with Star Alliance Rewards.

There is actually no such thing as a "Star Alliance ID" for individual passengers, as Star Alliance is a network of partner airlines rather than a single entity with its own loyalty program. Instead, your "ID" is simply your frequent flyer number with any of the 26 member airlines, such as United Airlines MileagePlus, Lufthansa Miles & More, or Air Canada Aeroplan. When you join one of these programs, your membership number serves as your identifier across the entire alliance. To find it, you should log into the website or mobile app of the specific airline you registered with, or check your physical or digital membership card. This number is what you provide when booking flights on any Star Alliance partner to earn miles and access benefits like lounge access or priority boarding. If you have reached a high enough tier, your status will be labeled as "Star Alliance Silver" or "Star Alliance Gold" on your boarding pass. If you've forgotten your number, the easiest way to retrieve it is through the "Forgot Member Number" link on your home airline's login page using your email address and personal details.