I’m glad you managed to work it out. Just to recap: the SGv2 does not support ‘captive portals’, e.g. WiFi where you have to visit some page and click on an agreement button or sign in to get full internet access. Sounds like you entered the SG’s MAC address directly into the captive portal router to white-list it. Perfect!
On the network tab the SG web interface does show network status. I would assume that the “motus.org” status was not “OK” before you fixed your issue. The “internet status” may have shown OK or not, it depends a bit on what the captive portal fakes…
Let me know if you have issues with that LTE hat.
Thorsten