I’ve never had this issue before, but in Bambu Studio it is refusing to apply ironing even though I have it enabled on the object. Even just trying with a basic cube, it will not apply the ironing. No change whether I select different ironing types. If I download one of the ironing calibration models from makerworld, those slice no problem. Really confused why this isn’t working 
any ideas?
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Disregard, I found the issue. I unknowingly had a custom print preset selected which was setting the top shell layers value to 0. I’ll leave this here in case anyone else runs into this same thing someday.
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Thank you so very much for posting the solution!
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