I think you chose the wrong dialogue option. When you come near the entrance to Drow city someone asks who you are. You have 2 options to say that you're Veldrin:
1. I'm Veldrin and I'm a patrol from the other city.
2. something like : I'm your humble Veldrin at your service.
The second one isn't drow-like (Drow are proud, cruel etc and not humble) so the guard knows you're not Drow and turn hostile. If you choose the other option he won't turn hostile.
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