I have the same Problem
400 https://api.twitch.tv/helix/channels?broadcaster_id=176277274
You necroed a 3 year old post… (So I moved this to a new post)
Whats the body response message say? It should contain a message that’ll tell you what the problem is. The HTTP code is half the information needed to help you.
If it’s a missing token it would be a 401.