Have you ever received an itinerary before and this is a new trip that you did not receive one?
If you have never used Concur Travel before to book a trip, some of our users experienced this problem. However, once they verified their email address in their profile, they were able to receive them.
Profile --> Profile Settings --> Email Addresses
Under the column "Verify", Concur will send an e-mail with a code that you then put in this location.
If you have already done that, it may be an issue with the TMC and/or Concur - depending on when you booked, I know there were a few partial outages and/or maintenance going on last week.
Hope it helps,