yellowshark 153
I suspect the wall of your alcove, at the bottom, is leaning over more (i.e. to the horizontal) that at the top. There is a setting for the overhang angle for support in the Expert dialogue box, which I think defaults to 30 degrees and I suspect the top of your alcove is leaning over less than this which is why no support is being generated.
You are probably printing too fast, too hot and maybe without enough fan, to get good overhangs. If you post your settings we can help and as Bagel Orb says, a picture would help (a print screen from Cura would be fine). Generally speaking overhangs need slow speed, 20-25mm/s and 100% fan and speeds all the same (this does though depend on the size and geometry of the piece; if the piece is filling the entire print bed then printing everything at 20mm/s is probably undesirable)
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bagel-orb 61
Did you try support everywhere instead of support on buildplate only? Basic > Support type.
Please send pics, I have no idea what your model and your problem look like.
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