You should enable this ppp interface and test the differ “data-channel=0 info-channel=1”.
I found that to this E3276 are a firmware files and you can re-firmware it to HiLink means like internal router inside E3276 who give lte1 interface for MikroTik. This is more transparent way.https://www.mediafire.com/folder/ll9ieqqooyhy5/Documents#3ct991w1v12np but the procedure to doit is not easy to just give you a few steps, you must find in your country a proper forum/help.
Thank for the answer.