We only want to know how often our promoted short URLs are clicked.
Unfortunately, when creating a project in the workspace with this segment, I get no results. I have tried to combine it with the pageurl (prop7), but I couldn't find any set up possibility to get results which can be then sent automatically every month
Correct - redirect pages cannot be tracked as they will not be shown in the browser long enough for a tag to fire. urs.boller's tip to use a query parameter to identify the redirect is the best practice.