We stumbled across the same issue with the LDAP Authenticator not working at all after having had installed and deinstalled the Active Directory Application.
I know this is an old topic already marked as solved, but we managed to get it running again without having to reinstall the whole wiki, so I thought it might still be worth noting.
For us it was the application-activedirectory-api extension which had stayed installed, a part or dependency of the Active Directory Application. After removing that the LDAP Authenticator started working for us.
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