I'm not convinced it's a networking issue since the same network allowed me to connect the Ultimaker 3 to the Cloud. Also, when I connect the S3 to the hotspot network, I am able to connect to the printer via WiFi and see the camera feed, etc. From what I see (and understand) in the log is that the IP is not recognized when I try to do the Cura Cloud connect but not before. I'm no expert at all so this may not be related at all but maybe the API is not grabbing the IP properly?
You also mentioned in one of your earlier post that there was a previous configuration that caused a bug. Do you see the same error in the latest logs or did the factory reset fix that?
I unfortunately don't really have access to another proper network and I can't bring the machine home either.
Thank you for your time, I'm really hoping we can find a fix to this because it is an important feature in our workflow here.