Don't use enough (with or without a noun) as the subject of a negative sentence, ✳‘Enough people didn’t come', but ‘Not enough did’.
Why is it so?
What other pronuns/determiners are restricted in the same way?
There may be some reason to avoid it, because it could lead to scope ambiguity. The sentence "Enough people didn't attend" could mean either "There were enough people who didn't attend" or "There weren't enough people who attended"; in the former case enough has scope over not, while in the latter case not has scope over enough. In many cases, of course, this distinction doesn't matter much.
But there's certainly no rule against this construction, and one can find plenty of examples of it.
The proposals to retire early were extremely generous, and if enough people didn’t take the offer, the agency was going to lay people off.
The NSW premier says the state is ramping up its compliance because enough people aren’t following the rules.
Maybe enough of us didn't understand that in 2011, finding it simpler and more fun to scoff at Stupid Ned Stark.
[...]enough people didn’t obey commonsense rules, so the virus spread[...]