First off, NEVER expose your OAuth tokens. They must be kept secret. Because that was a valid token I’ve gone ahead and revoked it so that it can’t be misused.
Secondly, the token you were attempting to use was for the id 699915193 as it was your own token, so you can’t update channel 141981764 which you specified in the broadcaster_id param because that channel is TwitchDev, and they haven’t given you permission to update their title.