Scatter with date on X and time on Y

I have this chart in Excel where I plot dates on the X and hours on the Y axis. Each dot is an event. This helps visualize busy times.

I'm trying to create the same chart in Power BI Desktop, but am failing miserably. The Y axis shows a count of times and the X axis shows a count of dates. I have created an Index column and dragged it to the details, the model shows the correct date format, but I still see only one data point in the middle of the chart. No date hierarchy. The only option is to switch to distinct count.