It looks like some excess body seam sealer to me ?.
Ideally should have been removed before it leaving the factory.
On the lefthand side of the photo, you can see another small bit of it hanging down.
Is it "the bottom of the door" or is it bottom of the the sill, on the seam ?
If it's the sill I wouldn't worry about it, just pull it off, maybe trim the excess of with a plastic knife or similar if it bothers you (assuming it's soft).
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