Our office network is allowing HTTP and HTTPS traffic through but blocks access to all external NTP servers, and out IT require us to use the internal one. When trying to connect the Glowforge this seemed to be the reason for it failing to work on our network, as your system want to access global NTP servers.
In your work for supporting Enterprise Networks have to implemented any way for the customer to change the IP address of the NTP server the glowforge needs to use during WiFi setup so we can get the device working.
Currently we have to use our personal cell phone as a WiFi hot-spot to do any work.