This admin command instantly completes the incubation progress of the egg you are currently looking at (i.e. that your crosshair is over). Because this command only sets the incubation progress of an egg to 0%, you will need to make sure that hatching conditions (temperature) are met in order for the egg to hatch.
Find below information relating to the HatchEgg command in Ark.
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This is the only way that the HatchEgg command can be used, after running this command, the incubation progress of the egg that your crosshair is over (target) will be set to 0%.