Negate and Union isnt working

so I’m trying to cut a hole in the roof for lighting by negating a part for the whole then I union the two parts together, its been working fine until now, could someone please tell me why?

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Do you perhaps have a duplicate part in place where you’re trying to negate? Try selecting the part and negative, and moving it a few studs up away from everything else.

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omg, I’m so stupid, I’ve been trying to union the negative part to the cylinder instead of the roof, I’m stupid xd

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