Report back the authentication issue.

[StefanFriptu]

Description

It is difficult to debug ldap settings. With the correct callback you can see what the authentication issue is.

Testing

• N/A

Checklist

• [N/A] I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• [N/A] All active GitHub checks for tests, formatting, and security are passing
• [N/A] The correct base branch is being used, if not master