The process of using Twitch’s Client ID and Client Secret is not specific to Nightbot. The very search of “client_id” in these forums here pulls up a multitude of matches, just not one that matches my exact question. I have not yet gotten to the point where I work within Nightbot at all because I cannot generate my TWITCH access token.
You shouldn’t be using your Twitch ClientID/secret with nightbot’s API and if thats what you are doing that is likely the issue.
You’ve used the wrong security credentials, as Twitch ClientID/secret is only valid for the Twitch API, and won’t be valid for Nightbot’s API, as per their documentation which I’m not familar with.