Sounds like your humidity was too high. Try again with a lower humidty. Then increase if the air cells get too large.
Follow this image. It will show you where they need to be
Well there’s nothing you can really do at this point besides decrease your humidity. If the air cell isn’t changing your incubator is too high in humidity.
Do you have a hygrometer inside your incubator? Never trust the incubators reading. You need a calibrated thermometer and hygrometer.
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If the air cell is not changing the chick may have passed away. Wait until day 21 then see if it externally pips. If not you can do an eggtopsy on day 22 or day 23.
For now do not mess with them and let them do their thing. The less you mess with them during lockdown the better.