Problems with LDAP authentication on out-of-domain PCs

[damiano82]

Hello everyone.
I connected Veyon Configurator to the domain controller that acts as an LDAP server. No problems for PCs within the domain.
For PCs outside the domain, despite changing the DNS to the DC's, I can't authenticate. All Veyon Configurator tests work correctly, but when I open Veyon Master, there's no combination that allows for successful login. I've tried username, domainname\username, username@internal.domainname.
Nothing doing, I don't know what to do. Even AI can't fix it.