Why does https://users.roblox.com/v1/usernames/users return 415?

Hey there.
I wanted to make a quick script with https://users.roblox.com/v1/usernames/users however the API seems to return 415 NO MATTER WHAT I do.

I use native JavaScript:

var userFetch = await fetch("https://users.roblox.com/v1/usernames/users", {
    "headers": {
        'Accept': 'application/json',
        'Content-Type': 'application/json'
    },
    "body": JSON.stringify(
        {
            "usernames": [
                "Test"
            ],
            "excludeBannedUsers": true
        }
    ),
    "method": "POST",
    "mode": "no-cors",
});

Any help?

Had to do with the mode: no-cors argument. Thanks anyway.

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