When you’re creating a chart widget and are using valueAxis customization with min/max or minValueMargin/maxValueMargin properties, you need to include valueType within the valueAxis property and argumentType within the argumentAxis property:
If you do not add those, you will not be able to add a widget to a dashboard.
You will instead get a white blank widget when you drag it on to a dashboard and it will not ask you to add the parameters and run-time intervals: