Just found on the help page :
My attendees are not receiving reminders for recurring meetings.
Attendees are not being reminded for a recurring meeting.
Reminder email is only being sent to the host of the meeting.
Note:
This is by design.
Solution:
Workaround
Have the attendees add the meeting to their calendar by double clicking on the calendar attachment in the meeting invitations. The calendar appointment will reflect the recurrence and a 5 minute reminder will be set by default.