Wireless Joint

The newer builds require you to delete the IPV6 prefix on the Network->Interfaces global options/settings tab at the top of the page. Delete the setting there, leave blank, and reboot.

You'll need a newer build to get the band locking UI

So it is connecting to the internet? You're just not getting an IPV6 address? This is common, I've seen it from one connection to the next, and even one system to the next. It is odd.

Run the AT command AT+CGDCONT? to see if the IPV stack is being presented as dual stack or IP only. The rest is up ...