Hi Justine,
Only Timeentries Daily slices (#55555) are now included in Data Warehouse. The rest of the slices are Weekly, Monthly and Fiscal. So at this point this is how things are designed.
You may want to use the PPM datasource for your reports for now and raise an idea on the Ideas page to include the slices you need to be included OOTB.
May I ask why exactly you need Daily slices in your reports? Why would your report not work with Weekly Allocation and Availability data instead?
Usually the reporting goes by Months or Weeks and Daily precision is not needed as it is lower level. Please do include this explanation in your Idea as well so the Product Management team can consider this scenario of usage.
Hope this helps -Nika