Integromat API call to Google Sheet to Rename Sheet

Question

So I am using the following code to try to rename a worksheet with a name pulled from Asana however I get a 404 error and can't work out what I am doing incorrectly I have replaced the fields with the variables for my sheetid and the name which will change but I keep getting the 404 error, I have used single quotes double quotes no quotes no idea. Code below

{
    "requests": [{
        "updateSheetProperties": {
            "properties": {
                "sheetId": "id-of-the-individual-sheet-to-be-updated",
                "title": "your new sheet name"
            },
            "fields": "title"
        }
    }]