Fresh Evokers that have completed the Evoker Starting Experience cannot use Chromie Time Dungeon Que for the following Expansions:
Classic Dungeons
Burning Crusade Dungeons
Wrath Dungeons
The following tool tip says:
“You may not que for this.
You do not meet the requirements for any dungeons in this category.”
For Mop onwards apart from one or two dungeons, they seem to be queable. Some are locked with the previous message.