login endpoint:

 res.header("authorization", accessToken).send(accessToken)
 const user = await prisma.user.findFirst({
    where: {
      email: req.body.data.email,
    },
  });
  const accessToken = jwt.sign(
    user,
"my secret token there"
  );
 if (!user) return res.sendStatus(400).send("Email doesnt exist");
  res.header("authorization", accessToken).send(accessToken)

router.get("/getAccountInfo", authenticateToken, getAccountInfo);

middleware authenticateToken :

export const authenticateToken = (
  req: Request,
  res: Response,
  next: NextFunction
) => {
const authHeader = req.headers["authorization"];
...more code
}

authHeader is undefined

in login endpoint headers see authorization but middleware doesnt