We also recently got an S5 Pro Bundle and are also having issues with connecting our Ultimaker to our network.
I am also at a large company with an established network and security protocols. Due to this, our hostnames have a length limitation of 18 characters. We also need static IPs, but that seems to be configurable via connman.
Renaming the printer did not change the hostname, just the printer name.
I tried changing the hostname via the Developer mode (/etc/hostname and hosts, etc.) and seems to partially go through, but it causes errors, still appears as the old hostname on the touchscreen, then reverts back to the "ultimakersystem-<MAC>" format at power cycle.
Do you have any suggestions on how to permanently change the hostname?
Thanks