Don’t send it as a “CancellationToken”
Also you don’t have to post screenshots
Just do four spaces and your code
like this
So
await httpclient.PostAsync("https://id.twitch.tv/oauth2/revoke?client_id=" + client_id + "&token=" + token);
The cancellationToken is nothing to do with oAuth revocation it’s for C# to receive a notification of a cancellation of the request.