My NOK5G21 is not utilizing EN-DC as it will not grab a secondary signal like it is suposed to. My gateway is on n71 primary but it will not grab a secondary signal or flip to n71 on secondary and grab the much stronger signal LTE in my area band 2, 12. T-Mobile is no help with these devices, they dont seem to know anything about their product or how to work them. Very disappointed in their tech team. Does anyone have any idea on how to get it working?