After Giving Corrrect user token , my backend says invalid jwt

useEffect(() => { const fetchData = async () => { try { const userToken =JSON.parse( localStorage.getItem("cookieFallback")); const token=userToken[a_session_${process.env.REACT_APP_PROJECT_ID}] console.log(token) const config = { headers: { Authorization: Bearer ${token} } }; const response = await axios.post('http://localhost:3001/dashborddata/',null,config); console.log(response.data); } catch (error) { console.log(error.message); } };

fetchData();

}, []);