How do I get rid of these dark lines on transparent glass?

Why isn’t this transparent dark line disappearing? I have already tried making it a union, changing the material to glass, exporting the union as a mesh, and I even checked if there was a gap in between the 2 parts. There was no gap, but the line does not disappear no matter what I do. Is there a way to get rid of it?

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This may be your issue