Where is the "Tailscale tab"?

[Geoff_Coupe]

Ah - yes, that’s the issue. Have a look here:

ROCK 2.1 only on UEFI build?

So you’d have to reinstall ROCK with the NUC set to UEFI. However, the only practical difference is the Tailscale support. If you need this right now, your only option is reinstalling. However, it may well come to BIOS installations later: (Yes I know it only says Nucleus but I suppose ROCK may get it too) @miguelito wrote instructions here: