As part of the Wintersday update, Lionguard Lyns, the Captain’s Council Commendation vendor that was added during The Lost Shores update, was disabled from allowing players to purchase items from her station in Lion’s Arch. Players were originally told that the vendor would be available during Wintersday, but it seems that the re-addition of this NPC will take place after the holiday comes to a close. Here is the dev tracker announcement, which was posted on the official forums yesterday:
Originally posted by ReginaBuenaobra (Source)
We do not have an ETA on when Lyns will be accepting commendations. To clarify about timing: this will not happen during Wintersday, but in a future game update. Sorry about the confusion, everyone, and thank you for your patience.