Ldap: UPN-Formated Usernames are not working

It's not possible to use the UPN-Format (Domainname) if you authenticate with ldap. This confused the user because they have to enter in all other cases there username in the UPN-Format.

Than I think it's a bug because the samAccountName is outdated since a loooonnng time (pre win 2000)
https://docs.microsoft.com/en-us/win...rprincipalname

Steps to reproduce:

1. Configure Ldap to AD.
2. Create $Username in Zabbix
3. Try to login with $Domain\$Username or Username@$Domain.xyz

Result:

1. Login Failed

Expected

1. Login working with $Domain\$Username or Username@$Domain.xyz