Why Is a Task Not Syncing Over to My Google Calendar?

Configure your Task Type settings to ensure scheduled events appear on your calendars.

Take a look at your Task Type settings. Likely what is happening is that the Type of Task you've created is hidden from the calendar view.

To confirm this, Edit the Type that is assigned to the Task in question and uncheck the box next to "Hide from Calendar View?"

Click +Save to implement your change.