I was having the same issue with my qc25's and i bought a headphone/mic splitter like this (https://www.amazon.com/gp/product/B00Y4663GG/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1) which didnt work when plugging straight into my computer, but the mic and headphones did work when I used the usb...
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