I have tested two different carriers (FirstNet and Verizon) on three different MV55 routers, in addition to one MP70 without success in getting a public static IP to work. Each router received the correct APN according to the Verizon/FirstNet reps, but they will not connect to the network.
All devices have updated firmware, and I am unable to find any settings besides the APN related to setting a public static IP. This is happening on every device I have tested, so I feel it must be related to the Sierra settings. Has anyone experienced this and found a fix?