Cellular M.2 modules are not support for use in the Intel NUC NUC8i5BEH.
Unable to confirm if the Intel NUC's M.2 slot can be used for cellular modules.
The 2280/2242 M.2 port on the Intel® NUC is reserved for storage modules only. The other 2230 M.2 port is reserved for the pre-installed Wireless module. Installing modules other than storage or Wifi is not supported.
For more information refer to the Technical Product Specifications section 126.96.36.199 Add-in Card Connectors.