Hum … You doesn’t answer to my question, but I found my problem .
First, my problem was : EventSub Subscription Types | Twitch Developers tell to use “a user OAuth access token with scope set to channel:read:goals.” ( so, I understand “an user token”, not an App token )
Second, I forgot the scope “channel:read:goals” when asking the broadcaster token ( maybe because the sentence telling to use this scope is not the same as the others )
Adding the scope, and doing the request with the app token resolve my problem .