Zaishen Challenge didn't unlock(?)

I got the Team Trials quest and won all 4 matches, then talked to Challenge Master Rioka to complete the quest, but I don't think the Zaishen Challenge missions unlocked. There are no NPC's offering the missions at the Zaishen Challenge outpost.

I ran Team Trials a second time, which didn't change anything. The only map points I have are the temple, Zaishen, and Random Arenas. What am I missing here?

http://gw.gamewikis.org/wiki/Zaishen_Challenge

reThe Zaishen Challenge is located on The Battle Isles.

To be able to map travel to the Zaishen Challenge you must first "unlock" it. This is done by beating all 4 computer AI teams in the Training Arena (found on the Isle of the Nameless). After beating the fourth team you will be transported back to The Battle Isles. You will then be able to map travel to the Zaishen Challenge, where you will be able to select a battle arena from the ""Select Mission"" button on your Party Menu.

Unlocking is per account. This means that once one character has unlocked it, all the characters on the same account will have the area unlocked

I was looking for quest givers and didn't notice the new button in the party window.

no problem man that should state that somewhere when u first enter