Sink Will Not Drain! Help!!!!!!!!!!!!!!!!!!!

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I am having a problem with a bathroom sink. It will not drain. I have replaced all the parts and snaked the line from the wall. I have also had two plumber come and snake the sewer line form the house to the main sewer. They have even put camers done there to make sure there are no clogs. There are no obstruction and if you form water into the drain in the wall, it flows fine. you can even see the water running when you look done the clean out in the back. It is only when I reassemble the sink to the wall that the water will not flow. There is nothing clogging the drain form the basin to the wall and every other drain in the house works fine. Does anyone have any idease why this is happening? I an desperate!!!!!!!!!!!