My demo user function is saying incorrect password even though I'm getting the credentials from the seeder file

Question

For context the normal login works with the handleSubmit function

What the react looks like:

function AuthPage() {
  const dispatch = useDispatch()
  const navigate = useNavigate()
  const [email, setEmail] = useState("");
  const [password, setPassword] = useState("");
  const [errors, setErrors] = useState([]);

  const demoLogin = async (e) => {
    e.preventDefault();
    const demoEmail = 'demo@aa.io'
    const demoPassword = 'password'
    const data = await dispatch(login(demoEmail, demoPassword));
    console.log(data)
    if (data) {
      return setErrors(data);
    }
  }

  const handleSubmit = async (e) => {
    e.preventDefault();
    setErrors([]);
    const data = await dispatch(login(email, password));
    if (data) {
      return setErrors(data);
    }
    navigate('/channel')
  };

What the store looks like:

export const login = (email, password) => async (dispatch) => {
  console.log(email, password)
  const response = await fetch('/api/auth/login', {
    method: 'POST',
    headers: {
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      email,
      password
    })
  });

  if (response.ok) {
    const data = await response.json();
    dispatch(setUser(data))
    return null;
  } else if (response.status < 500) {
    const data = await response.json();
    if (data.errors) {
      return data.errors;
    }
  } else {
    return ['An error occurred. Please try again.']
  }

}

The backend:

@auth_routes.route('/login', methods=['POST'])
def login():
    """
    Logs a user in
    """
    form = LoginForm()
    # Get the csrf_token from the request cookie and put it into the
    # form manually to validate_on_submit can be used
    form['csrf_token'].data = request.cookies['csrf_token']
    if form.validate_on_submit():
        # Add the user to the session, we are logged in!
        user = User.query.filter(User.email == form.data['email']).first()
        login_user(user)
        return user.to_dict()
    return {'errors': validation_errors_to_error_messages(form.errors)}, 401

And the seed file:

def seed_users():
    demo = User(
        username='Demo', email='demo@aa.io', hashedPassword='password')
    marnie = User(
        username='marnie', email='marnie@aa.io', hashedPassword='password')
    bobbie = User(
        username='bobbie', email='bobbie@aa.io', hashedPassword='password')

    db.session.add(demo)
    db.session.add(marnie)
    db.session.add(bobbie)

    db.session.commit()

In my backend terminal I get:

sqlalchemy.exc.ProgrammingError: (psycopg2.ProgrammingError) can't adapt type 'dict'

What the demoLogin function looks like now is after a bunch of trial and error, they were originally just strings, or the function wasn't async and didn't have an await. I've tried a bunch of different variations. I'd appreciate any help!