Incompatible Operating System

Receiving the following error when trying to load the Insider flight on Steam:

"Incompatible Operating System Version.
Please Update your Windows 10 Operating System to the Fall Creators Update (version 1709) or higher."

Have tried updating my OS, installing optional updates, tried one users fix from a reddit post to no avail.
Pretty floored if I am being honest that I am receiving an error (along with many others) to update our OS to a version that came out in 2017.

Anyway here’s my PC specs, hope it helps you diagnose whatever causes this issue, 343.

Edition: Windows 10 Home 64 bit
Version: 21H1
Installed on: 9/‎21/‎2020
OS build: 19043.1151
Experience: Windows Feature Experience Pack 120.2212.3530.0

PC Specs:
CPU: Ryzen 7 1700 8-Core 3.00 GHz
GPU: GTX 1070Ti
RAM: 16 GB
DirectX Version: DirectX 12

If you are experiencing issues with the Halo Infinite Tech Preview, please refer to the Halo Insider Support page for known issues and ticket submissions.