It's not necessary to be level 150 to get the quest. It should look like this in your quest log:
Look for any other quest with this color, it might be that you've already done part of it. Following quests could be called:
- Primal World Messenger
- Door to Primal World
- The Worldspire
- At the Worldspire
- Archosaur Student
Enter the Primal World to check if you get any pop-up with a purple color, like these:
- Sacred World (First)
- Reflection
- Into the Arcanum
- Energy
- Feel the Power Inside
- Flow of Power
- Flow of Heart and Soul
- Fill Your Body
- Peace Fills the Body
- Enlightenment
- Enlightened by the SW
- Boundary Break
- Reflection
- Energy
- Flow of Power
- Fill Your Body
- Enlightenment
- Mirage Sky Calling
Also, press C and look under your portrait to see if there is any text there:
Did you check all of these? If the quest is still missing, as basic as it sounds, try relogging.