JWT token with API Gateway returns unauthorized all the time

I have an axios call using JWT token that works when I call the EC2 instance directly, but when I call it through the API Gateway, it returns:

success:    false
message:    "unauthorized access! no headers!"

here is the nodejs code:

exports.isAuth = async (req, res, next) => {
  if (req.headers && req.headers.authorization) {
    const token = req.headers.authorization.split(' ')[1];

    try {
      const decode = jwt.verify(token, process.env.JWT_SECRET);
      const user = await User.findById(decode.userId);
      if (!user) {
        return res.json({ success: false, message: 'unauthorized access!' });
      }

      req.user = user;
      next();
    } catch (error) {
      if (error.name === 'JsonWebTokenError') {
        return res.json({ success: false, message: 'unauthorized access!' });
      }
      if (error.name === 'TokenExpiredError') {
        return res.json({
          success: false,
          message: 'sesson expired try sign in!',
        });
      }

      res.res.json({ success: false, message: 'Internal server error!' });
    }
  } else {
    res.json({ success: false, message: 'unauthorized access! no headers!' });
  }
};

here is the Reactjs code:

const headers = {
   Accept: 'application/json',
   'Content-Type': 'multipart/form-data',
   authorization: `JWT ${token}`,
};

return axios.get(BE_URI + "/fetch-general-news", { headers });

I did however make sure the API Gateway’s endpoint allowed headers, but it looks like the headers are not being forwarded, what am I doing wrong?