Quote Originally Posted by Nagashi View Post
Is it because I haven't unlocked my chocobo?
You need a Chocobo License from the quest "My Little Chocobo" that you get from a Grand Company guy. You join a GC by playing through the main story. Once you get your choco from that quest your other mounts unlock. I had this same problem for my Legacy and Goobbue mounts until I got my choco unlocked from that quest.

You can do a search on this problem to confirm what I said, or go to the In-Game Bugs section of the forums where a few people including me made threads about this.