nova lte-m

I recently purchased NOVA LTE-M module. I inserted the hologram sim and connected the antenna. But, when I plug it into my ubuntu desktop USB, I see the blue power LED come on, but i don’t see the network LED. I have previously tried the 2G/3G module and it has worked successfully for me. I also tried another hologram sim that I had with the same module but had no luck, also tried a second external antenna as well with no luck. I tried to send AT commands to the module. AT and ATI commands worked, but other network commands such as AT+COPS=?,AT+CGREG?,AT+CCID all returned error.

What could be the issue with the LTE-M module? Any help is appreciated.