Column Formatting for Status column not working

Yarrah 

Use this it should work

{
"$schema": "https://developer.microsoft.com/json-schemas/sp/v2/column-formatting.schema.json",
"elmType": "div",
"attributes": {
"class": "=if(@currentField == 'Approved', 'sp-field-severity--good', if(@currentField == 'Pending', 'sp-field-severity--low', if(@currentField == 'Closed', 'sp-field-severity--warning', if(@currentField == 'Rejected', 'sp-field-severity--severeWarning', 'sp-field-severity--blocked')))) + ' ms-fontColor-neutralSecondary'"
},
"children": [
{
"elmType": "span",
"style": {
"display": "inline-block",
"padding": "0 4px"
},
"attributes": {
"iconName": "=if(@currentField == 'Approved', 'CheckMark', if(@currentField == 'Pending', 'Forward', if(@currentField == 'Closed', 'Error', if(@currentField == 'Rejected', 'Warning', 'ErrorBadge'))))"
}
},
{
"elmType": "span",
"txtContent": "@currentField"
}
]
}