As far as i am aware, the printing requires your services to be publicly accessible. Are yours?
Dear StevenGriffith,
Although you posted long years before I am facing a problem with PrintTask with my own ArcGIS Server 10.8.
PrintTask and Map Services are on the same physical local server. The print task (through JSON) is not able to get map services from the same server whereas other map services are accessible through another live server. Previously it was working fine but suddenly, the print task stopped accessing map services from the same server through a local IP address.
The problem is how can I access map services through PrintTask on the same physical server (through LocalIP or LiveIP).
Your prompt response will be highly appreciated.
Regards,