I can confirm that the AX200 works OK when plugged in a x1 PCIe slot, and does 
NOT work in a x16 slot. In the later case it generates the before-mentioned 

 "NMI_INTERRUPT_UMAC_FATAL"

followed in the logs by

 iwlwifi 0000:01:00.0: Failed to start RT ucode: -110
 iwlwifi 0000:01:00.0: Failed to run INIT ucode: -110


My setup is 
* Gigabyte Z97M-DS3H motherboard
* Fenvi FV-AX200 PCIe x1 adapter card with an Intel AX200NGW NGFF M.2 card
* CentOS 7 (stock 3.10.0-1127.19.1.el7 and mainline 5.8.7 kernels tested)

I want to point out that the adapter card works fine in the x16 slot
when used with another WiFi module (DELL's DW1820), so the problem
clearly lies with the AX200 not negotiating its PCIe configuration with
the motherboard/chipset.

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https://bugs.launchpad.net/bugs/1848831

Title:
  Intel WiFi AX200 [8086:08b1] subsystem [8086:4070] firmware loading
  error resulting in no wifi

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