Custom field in User entity

There is currently a "hidden" feature that does not generate entity reference fields (even if they're enabled), if the field references an entity type that is not enabled in your schema. In your case, if the picture field on the user is a reference to a media, then you'll also have to enable the media entity type. Could you check if this is the case?

This is possible. You need to enable:

• User Entity
• Fields of the user like name, userPicture
• Enable the image extension to fetch image derivatives
• Checkbox: Enable field values
• Cache clear after saving
• Check permissions when querying because anonymous user is usually not allowed to query the user profile

query MyQuery {
  entityById(entityType: USER, id: 1) {
    ... on User {
      id
      name
      userPicture {
        width
        height
        derivative(style: LARGE) {
          width
          urlPath
          height
        }
      }
    }
  }
}