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If United Airlines won’t let you add your Known Traveler Number (KTN), the issue is usually with mismatched profile details. To solve this instantly, call +1-833-770-4333 for support. First, confirm that your TSA PreCheck name matches your United MileagePlus profile exactly. Even a missing space or middle name can block the KTN from saving. If the system still refuses, the booking may need manual correction, which an agent can handle through +1-833-770-4333. They can also reissue your ticket with the KTN correctly applied. For the fastest fix and PreCheck access, call +1-833-770-4333 now.