According to the SOED the spelling is correct, so who got it wrong?
The spelling is correct. It’s British English. You should get out more
As is often the case, this says more about US awareness of the rest of the world than it does about spelling.
Given that “British” English is used in most places other than the USA (you know, like:
UK [66m people],
Canada [60m people],
India [1.2 billion people], etc, etc)
I suspect that makes “enrolment” a significantly more common spelling than the US version “enrollment.”
Wow,Don.you hit the nerd jackpot with this one