Hello,
It seems I have to repeat this thing every now and then so I shall.
If you are an enemy of Myth Drannor or banned from Myth Drannor you can't go there to do their quests.
That means if you are either a Zhent, Malarite, Drow or even a known Warlock.
If you are, however, an unknown enemy you may enter and do whatever you wish.
BUT if you description says:
"A glimpse of fire can be noticed in his eyes"
Or
"The Symbol of Bane is engraved on her chest armor"
Or
"Am amulet around his neck with the symbol of Malar can be noticed"
You cannot enter Myth Drannor.
If you will get reported you will lose a lot of XP due to that.
This is a first and a final warning.
I really don't like to go there so please pay attention and don't metagame.
Light.