The usual over moisture issues. Try again but leave them in open air for circulation this time. Make sure you have lots of holes in bottom and middle section of you cup. You could also try water rooting or other ways. Excess moisture in soil is almost always the cause of rooting failures. We all did it! If the soil looks wet it is too wet! Figs are fighters, actually hard to kill except with over watering soil! Do some research on rooting methods.
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