Enrolment expiration notifications sent to teachers current contain two pieces of information:

1-The names of students whose enrolment expires exactly at the threshold.
2-The names of students whose enrolment expires at less than the threshold.

However, the crucial piece of information that is lacking is the students who have just now expired and have automatically been unenrolled. Especially in a paid course where one might wish to encourage students to extend their enrollment, having them suddenly disappear without a trace doesn't help with that at all.