Ahoi,
I’ve found out that recurring events that shall end at a certain date only work with English (American?) date format. So I was quite confused and struggled with getting my recurring events work 
I’m from Germany and use a language pack for Scheduler so all dates are like dd.mm.yyyy, but while creating recurring events and using the option „End by“ the format is mm.dd.yyyy.
That really confused me and I had to spend some hours to find the problem
It’s just a suggestion for improving Scheduler in next version.
Best wishes