The SIM7600G-H is a Verizon "approved module". When a manufacture uses modules that have already been approved by Verizon, they can reduce their devices certification effort. Once a manufacture has their device certified the manufacture can enter IMEIs for their devices into the Verizon DMD and then the devices they sell will be able to get onto the Verizon network.
M5Stack has not yet taken these steps, and until they do the COM.LTE module will not work on the Verizon Network.
I have reached out to M5Stack and the have stated they cannot help.
I reached out the SIMCOM, and they indicated the M5Stack needed to get the device certified.
The only alternative I see to this is to create a ‘company’ and try to get the device certified under that company’s name. (I am considering this for the learning opportunity, but it may not be worth the effort for something I will play with for a week or 2.)
Point of all of the above is buyer beware, the COM.LTE will not work with Verizon.