Upper ice maker stopped - Solved.

Not sure I understand, but the door water dispenser works as does the freezer ice maker.

I have the exact same problem with my Frigidaire. It was working fine last week until I emptied the upper tray. It hasn't dropped a single cube since. Bottom tray works fine.

If it's freezing up chronically. You'll likely need to replace a thermistor or the control board. Obviously in forced defrost the heater works so you know the heater and the defrost thermostat are good.
In my experience with frigidaire. The defrost thermistor fails and gives the wrong ohms reading to the main board. The machine can't tell its icing over. The upper icemaker stopping is step one. Step two is the freezer ices over and needs to be manually defrosted.

If this problem returns. You will need to have someone check the ohms of the thermistors at the control board. If they are in spec replace the control.
On your fridge it's behind the air vent at the front bottom left side of the fridge.

Another helpful video including increasing ice production.

Change the thermistor in the freezer or the control board. The control is easier for the diyer to change but is more $$. But in my experience it's 50-50 control or thermal.

I use a chart. Every brand has a specific ohms the thermistor should read at a set temp. If I find a thermistor reading 50-70° yet is covered in ice I know that's the problem.

Though if it's only the icemaker freezing up. And the heater works. Many times it's the logic on the board that is bad. It can't be reflashed easily so best to change the control.