title: Identity Server 4 : Sorry, there was an error : unauthorized_client
body: <p>I have set up identity server 4 to extent Umbraco so it uses a custom role provider. </p>
  
  <p>Everything was working but now when I get redirected to my Identity server I get this error:</p>
  
  <p><a href="https://i.stack.imgur.com/1dZ8u.png" rel="noreferrer"><img src="https://i.stack.imgur.com/1dZ8u.png" alt="enter image description here"></a></p>
  
  <p>Can anybody shine some light on this error? I have tried rolling back my code in source control but nothing I do seems to help it. Is there anywhere I can see an error log? </p>
  
  <p>Thanks,
  Scott</p>