How important is it that the name on my airline ticket, passport, driver’s license, frequent flyer accounts, and known traveler program match exactly?

Very important! The first question asked by airlines if you are inquiring about why you aren’t getting your miles, or by TSA if you are inquiring about why you may not be getting Pre-Check benefits is always, “Do the names match exactly”. If not, they will ask you to make the relevant name changes and wait to see if that corrects the situation. In the case of Pre-Check you may need to wait through several trips since the benefits are not guaranteed and are received a maximum of about 80% of the time.