If you needed illusion and faction to complete the quest you might have only been given the illusion benefit. The alliance line only works with one faction at a time. You could have boosed the faction with him, then allianced another guy on a different faction you go back to regular faction with the previous until you zone and they all reset.
Try to illusion then get the quest text with him, if no text the quest probably will not work. If you illusion + alliance and get the quest, the above was the reason why it didn't work.
The illusion could have been an issue but take that out of the equation by repeating the steps without the illusion and just use alliance.
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