Flexbox Not Working with Modern Form Header (Configure Layout Using JSON)

Darian Glover 
Add a flex style at the root div of your JSON - 

{
    "$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
    "debugMode": true,
    "elmType": "div",
    "style": {
        "display": "flex",
        "flex-direction": "column"
    },
    "children": [
        {
            "elmType": "div",
            "style": {
                "display": "flex",
                "flex-direction": "row",
                "width": "100%",
                "font-style": "italic"
            },
            "children": [
                {
                    "elmType": "div",
                    "style": {
                        "color": "red"
                    },
                    "txtContent": "Icon Position"
                },
                {
                    "elmType": "div",
                    "style": {
                        "flex-basis": "100%",
                        "display": "flow-root",
                        "color": "blue"
                    },
                    "txtContent": "Header Position"
                }
            ]
        },
        {
            "elmType": "div",
            "txtContent": "Form Instruction Position. Lorem ipsum dolor sit amet, consectetur adipiscing elit. Fusce a massa ante. Phasellus mattis felis non tortor bibendum, in laoreet tortor auctor. Nulla varius, nibh eget sollicitudin iaculis, urna mauris finibus mauris, at malesuada mi ante eget metus. Cras aliquam mauris urna, nec rutrum purus laoreet vitae."
        }
    ]
}