PubSub: ERR_BADAUTH even if scope is ok

I’m using the endpoint : https://api.twitch.tv/kraken/channel to find the channel id. So it’s the right one. And if I only keep the following topic, I don’t have the error, and if I try a follow on my channel, I’ve got the message through pubsub which confirm it’s the right one.

Any idea ?

Is there another to find my channel id ? I’m using v5 api for that, which is deprecated. Maybe there’s something new ?