SlackProvider not returning Slack user id

[tinypell3ts]

I'm using the Slack Provider with NextAuth (v3.29.0). I need to get the users slack ID. However, NextAuth is only returning my email, name and image.

{
    "name": "joe.bloggs",
    "email": "[email protected]",
    "image": "https://secure.gravatar.com/avatar/dgd524d0fba870dc5fd754fa317b5843.jpg?s=512&d=https%3A%2F%2Fa.slack-edge.com%2Fdf10d%2Fimg%2Favatars%2Fava_0022-512.png"
}

The slack API docs say it should be returned by default - https://api.slack.com/methods/users.identity

&&

The user.id is being returned here - https://github.com/nextauthjs/next-auth/blob/main/src/providers/slack.js

Here the user scopes for my app -

Is there something I'm missing?

Thanks

[balazsorban44]

https://next-auth.js.org/configuration/callbacks

[tinypell3ts]

Ah, sorry I missed the callbacks. Thanks @balazsorban44

        callbacks: {
            async session(session, user) {
                return user;
            },
        },