400 when pushing a date to Power BI

Hi

I am trying to push some data to Power BI.

My json looks like this: 

{
"Backup": "3",
"Restore": "1",
"DateTime": "2016-09-26T20:14:26:047Z"
}

The DateTime is a date in Power BI. If i try to post this I get a 400 bad request. If I dont have the DateTime in the json then everything works ok.