We recently upgraded our Office 365 to SharePoint 2013 and one of the features I was looking forward to was the task aggregation in My Site. Sadly it does not seem to work at all. I have several tasks over several sites assigned to me but I get no tasks listed on "My Tasks". It seems to list the sites where I have tasks if I click the filter button but there are not tasks listed. If I switch to "Important and upcoming" one of the tasks is listed but others with the same dates are not.
Several colleagues have reported similar behaviour, anyone have a clue what it could be?