It's a new NUC11TNKi7, I misread/misunderstood the USB power settings in the BIOS menu and disabled power over all USB. I rebooted and realized immediately my error...
I should be OK with a thunderbolt extender/dock or USB extender/dock with external power supply I think but I have neither of those right now.
Should be OK Monday but what can I do in the meantime?
I'm assuming that in BIOS setting Advanced > USB, you have set to Disable or No Detect
1. If the setting is Disable, the USB keyboard/ mouse is still available during POST. While you see the Intel NUC logo, click few times on F2, to enter BIOS setting and reset USB to Enable.
2. In case that you set USB ports to No Detect, the USB keyboard/ mouse is available in Windows. In Windows enter Windows Settings, Update & Security > Recovery click on Restart now, to boot into Windows Advanced Menu. In the Advanced Menu:
2.2. next click Advanced Options.
2.3. click on UEFI Firmware Settings and finally click on Restart. NUC will boot into BIOS settings.
Hope this helps