I am so sorry your chicks did not hatch.🙁 I would check the incubators temp for accuracy and make sure it is holding correctly. Maybe even let the manufacturer know and get your money back?
Read up on incubation here on the forum.
Also some excellent articles. We have all had to learn as we go...
I mean did you check with a separate themometer that has been calibrated and a salt tested hygrometer to verify the accuracy of the incubator? Many people do not know to do this. Even a brand new incubator can be off by several degrees, causing the eggs not to make it.
I do not know this incubator. Did you have a separate thermometer and hygrometer to verify your temp and humidity? If the temp was too high or too low, or the humidity was too high or too low, the chicks may not hatch. Also if there are extreme temp fluctuations. Had you used the incubator...