Fix (merge) vertices that occupy the same space?

I tried knife tool and got edges / vertices occupying the same space.
I tried “merge by distance” to fix this with no luck - Its says 0 vertices removed.

Is there an automatic way to merge multiple vertices into one if they are in the same space?

Thanks for help.

really strange that “merge by distance” doesn’t work.

Is there any opportunity to take a look to the file? At least that object?

Yes sure, I should have attached it in the first post.
Runway_02.blend (484.5 KB)

It’s working.

I’ve just opened your file and select “merge by distance”

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Argh,
stupit me - I tried without selecting anything. I thought in that case it would consider everything selected (coming from stoneage Lightwave where it worked like that).
Thank you.

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