When you get a 400 whats the response message?
Further more, you might want to look at doing a standard jQuery get instead of a getJSON so you can specifiy headers.
This call should make a call to api V3. However, both V3 and V5 are going away. And it’s worth noting that v5 requires ID’s instead of names.
I’m testing your code now to check whats up
Update:
Streamers is an array of one item, should be:
var streamers = [‘channel1’, ‘channel2’, ‘channel3’, ‘etc’];