Updated BIOS to 0065 using F7 Method. After the update and re-boot the NUC lost my Main display attached to the Thunderbolt port.
Fixed by disconnecting and reconnecting USB C to HDMI Cable and rebooting device.
Returned to Bios 0064 Today. I had numerous occasions with Taskbar icons missing on Extended HDMI port attached TV. Also recurring lost audio device issues after sleep(fixed on 0064 by disabling 2381 Intel Display Audio and Removing Realtek audio). I have also updated Lan/BT and Wifi drivers at the same time as I went to Bios 0065 but I'm leaving those installed, cant believe they have any impact on ICONS and Audio.