After validating: 401: Client ID and OAuth token do not match

API
3

Doh!

{ url: 'https://api.twitch.tv/helix/users',
  method: 'GET',
  headers:
   { 'client-id': 'bt5v6ewrxkgfs8ewy1k3bl98zxkzj4e',
     Authorization: 'Bearer <my app token>' },
  qs: { id: 136678973 } }

Now returns:

{"data":[{"id":"136678973","login":"dodgyblaster","display_name":"DodgyBlaster","type":"","broadcaster_type":"","description":"","profile_image_url":"https://static-cdn.jtvnw.net/jtv_user_pictures/f85ee872-573d-4e9d-bb35-6e27b9cf19a3-profile_image-300x300.png","offline_image_url":"https://static-cdn.jtvnw.net/jtv_user_pictures/a8b0813d-34dc-4344-966b-31f1684addb4-channel_offline_image-1920x1080.png","view_count":1819}]}

Thank you so much @BarryCarlyon for you time and advice.