You’re being redirected to http://localhost:3000 which means that’s what is configured in your app settings as a redirect, but in the URL you’re attempting to use https://qa.wwwechampions.com/tournament
This would indicate https://qa.wwwechampions.com/tournament is not set as a redirect uri, so Twitch is sending you to the one it does have on record for the app. If you do have it set as a redirect uri in the app settings, make sure it matches exactly as common mistakes are mixing up http and https, not including the path in the redirect uri setting, or having a trailing slash in one place but not the other.