This happens a few times in this game. You're told to go to xxxxx and you can't get in, like in the Vault of Ice when Za'ne sends you the first time. There's nothing wrong really, just go do something else and you'll come back around to it eventually. This is my first time through Dragonspyre but don't you have to defeat Ivan Soulsinger and free the brothers and sisters of Sunbrand before you go to the Hatchery? I could be wrong. Look at the help pages in Central and find the sequence.