I've now on my 4th Band 2 (batteries go dead), but I haven't been able to activate Cortana on the last two devices. I never seem to know if it is related to the current build on Insider Fast Ring or something I am not doing. Today, as I set up the 4th band, I am absolutely baffled by not being able to enable Cortana. It is, of course, greyed out and I have not maxed out the number of tiles. Is there anybody out there that knows if this is related to Fast Ring, or am I just missing something?