Nikon Z6ii - No Preview of NEF files in the Lightroom Importer

Hi Guys, any help appreciated!

Trying to work out how to get the lightroom importer to show thumbnail previews of my NEF files, so I can select the correct photos.

I'm a wedding photographer, and quick previews when importing before editing saves me a lot of time!
Just upgraded from my Nikon D750's to the Z6ii and hoping to get this functionality back.

I'm running an M1 Macbook Air (2020), with Lightroom specs below:

Lightroom Classic version: 10.4 [ 202108071231-af9219b9 ]
License: Creative Cloud
Language setting: en-GB
Operating system: Mac OS 11
Version: 11.3.1 [20E241]
Application architecture: arm64
Logical processor count: 8
Processor speed: NA
SqLite Version: 3.34.0
Built-in memory: 16,384.0 MB
Real memory available to Lightroom: 4,096.0 MB
Real memory used by Lightroom: 1,863.3 MB (45.4%)
Virtual memory used by Lightroom: 402,368.6 MB
Memory cache size: 52.1MB
Internal Camera Raw version: 13.4 [ 872 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2
Camera Raw virtual memory: 419MB / 8191MB (5%)
Camera Raw real memory: 420MB / 4096MB (10%)
Displays: 1) 2880x1800

Graphics Processor Info:
Metal: Apple M1