Creating and viewing reports in Google Data Studio is temporarily unavailable. We're working on getting this fixed as soon as we can.
To apply new fields that we have previously added to a report you need to refresh the report fields in data Studio. Follow the instruction below:
1. Go to Data Studio, click "File" and select "Report settings".
2. Click the pencil icon next to the Data Source menu.
3. Click "Refresh Fields" and then click "Done".