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    The leak is caused either by defective materials (the pop up assembly or the sink) or from improper installation. There is no way anyone here can know the cause. A guess would be the bottom nut has not been tightened enough or improper application of the plumbers putty. This is necessary to seal the drain flange to the sink bowl. Never use caulking in place of the plumbers putty and the thought to use teflon tape or pipe dope on the threaded pieces is absolutely wrong.
    – Kyle
    Commented Sep 4, 2022 at 16:37