I have 8 eggs on lockdown. 2 of them I am pretty sure stopped developing and 1 I could not tell. The other 5 I saw definite movement in several days ago.
I set up the incubator and monitored temperature/humidity for 1 full day before adding the eggs. Later on day 1 or 2 the temp went up to about 106, but probably not for too long. Most days the temp has been a bit on the low side.
Right now the temp is 97.5 with 55% humidity.
Edited to add: Eggs last candled on 10/15 and air cells marked. I have had the eggs upright in cartons w/bottom cut out until 10/17 - I then laid them down with the largest part of the air cells up. I have not handled them since.
Don't dispair! With lower temperatures the hatches take longer. I mistakenly set my incubator too low for some quail eggs and they were a full 3 days late. I almost chucked them, but then heard internal pipping and pecking, so back into the bator they went.
Optimal temps for chicken eggs is flatout 100, so -- yeah -- you're a tad low.