401 Error when sending axios get request with Auth Headers

In my react project, I have been using axios to help get data from MongoDB.

My axios get requests return a 401 error when I add my auth middleware as a param. This middleware requires the user to have a valid JWT token before any data is returned.

When making the request with Insomnia/Postman, as long as long as the user token is added to the request headers, I always get the desired data returned. However, when I try to get the data within the react application, I get a "Failed to load resource: the server responded with a status of 401 (Unauthorized)" error log, along with my custom json error response, "No Auth token, authorisation denied!"

I built a simple boolean function that returns true if the current user has a valid JWT token. Despite returning true, I am still receiving the 401 error as a response, which leads me to suspect there is a syntax or formatting error somewhere inside my react code.

Backend (with express):

router.get("/allauth", auth, async (req, res) => {
 const players = await Player.find();


const jwt = require("jsonwebtoken");

const auth = (req, res, next) => {
 try { 
    const token = req.header("x-auth-token"); 
    if (!token)
        return res.status(401)
        .json({ msg: "No Auth token, authorisation denied!" });

    //match token against .env password
    const verified = jwt.verify(token, process.env.JWT_SECRET);

    if (!verified)
        return res.status(401)
        .json({ msg: "Token verification failed, authorisation denied!" });

    req.user = verified.id;

    } catch (err) {
        res.status(500).json({ error: err.message });

React frontend:

export default function DisplayTeam() {

const [players, setPlayers] = useState([]);
const {userData} = useContext(UserContext);

 useEffect(() => {
    let token = localStorage.getItem("auth-token");
    const url = "http://localhost:5000/players";

    axios.get(`${url}/allauth`, {
        headers: {
            "Authorization": `x-auth-token ${token}`
        .then( response => setPlayers(response.data))
        .catch( error => console.log(error));
 }, []);

return (//display from DB);

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