I just wonder if something got misconfigured while Hey Google/OK Google was busted. I remember an error about something enrollment popping up on first boot and disappearing, might have been Hotword Enrollment.
Edit: No dice. Wiped everything and clean flashed. The switch isn't greyed out now, but now I'm getting this instead when I try to switch on Hey Google. I'm using the 04/01 micro OpenGapps package - those with it working, what are you using?
EDIT 2: I actually just tried the LOS ROM and I'm having the same issue, so it's not just this ROM. Not sure what's up. Global phone, 11.0.3.0.QEEMIXM firmware, installed Xiaomi.EU then wiped prior to switching ROMs... The only thing I'm seeing that might not be the same between my process and others' is micro gapps vs nano. I'll try nano and see if that does anything??
EDIT 3: Tried nano, still nothing. I'm officially at a loss.