Unable to get a folder created by another user with endpoint GET

Hello ! 
I'm currently developing in java and I can't get a folder created by another user, via API.
I'm also using JWT authentication and have followed this documentation: https://developer.box.com/guides/authentication/jwt/with-sdk/

Here's my Java class calling the Box APIs
    public BoxFolder getFolder(String folderId) throws BoxAPIException
    {
        return new BoxFolder(boxAPIConnexion.getAPI(), folderId);
    }

However, here's the message returned :
com.box.sdk.BoxAPIResponseException: The API returned an error code [404 | iw6ilehyqdmmt4w4.0bb5b98f9358163f0c50785d696f24cca] not_found - Not Found

Do you have any solutions?
thanks

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