I've looked at previous questions regarding this, and solutions seem somewhat varied. The last two times my wife and I have traveled together, she hasn't received the PreCheck notation on her boarding passes. Queries to TSA each time are met with "Code 13B Mismatch Issue" meaning that either the name or DoB are not in agreement with what is in her Trusted Traveler program.
After the first time, we triple-checked everything, and Name, DoB, and KTN match. All were provided to the carrier at booking - first time Delta, most recently United.
What I'm trying to find out is how to determine with more precision exactly what is wrong. Every possible way of contacting TSA just requires the same information which is processed in an automated way and provides the same templated text as a response.
Anyone know? I'm going to call the customer service line now, but am not hopeful.