There are several respiratory illnesses that can cause what you describe, but the following two are the most common:I think the issue is similar to a respiratory problem, but I don't know. I tried extracting the blockage, and that revealed a gross yellowish substance. I will keep trying to send the picture.
MG Mycoplasma gallisepticum Infection in Poultry - Poultry - Merck Veterinary Manual https://www.merckvetmanual.com/poultry/mycoplasmosis/mycoplasma-gallisepticum-infection-in-poultry
Infectious Coryza in Chickens - Poultry - Merck Veterinary Manual https://www.merckvetmanual.com/poul...tious-coryza-in-chickens?query=Coryza poultry