Https://api.twitter.com/1.1/account_activity/all/production/subscriptions.json says "Could not authenticate you"

[attouh]

Greetings,

• I successfully registered the webhook
• I successfully requested user access token with Sign in with twitter

Now I’m trying to subscribe the user to webhook using
POST https://api.twitter.com/1.1/account_activity/all/production/subscriptions.json

But response is 401 Unauthorized

{
    "errors": [
        {
            "code": 32,
            "message": "Could not authenticate you."
        }
    ]
}

What am I missing?

App ID: 14975877

Thanks

[attouh]

It appears I should specify webhook_id in request body. Documentation is missing that detail.
Ref: Account Activity API - All Activities (beta) whitelist failure
Working now!