Argument of type 'string' is not assignable to parameter of type 'never' Typescript error using enum

Question

I have a file, where I am using enum to hold all my routes strings

enum LoggedInRoutes {
  OAK_URL = 'OakUrl',
  PROFILE = 'Profile',
  ROOT = 'Root',
}

enum TestingRoutes {
  DATA_MANAGEMENT = 'DataManagement',
}

const Routes: { [key: string]: string } = {
  ...LoggedInRoutes,
  ...TestingRoutes,
};

export default Routes;

export type RoutesType = LoggedInRoutes | TestingRoutes;

I then import the Routes and use them like so:

import * as React from 'react';
import {Button} from 'react-native'
import { useNavigation } from '@react-navigation/native';
import Routes from './Routes';

const App = () => {
  const { navigate } = useNavigation();

  return (
    <Button
      title={'Go to url'}
      onPress={() => navigate(Routes.OAK_URL)}
    />
  );
};
export default App;

Typescript however throws an error

Argument of type 'string' is not assignable to parameter of type 'never'

Can anyone help? Don't know what I'm doing wrong