AD Domain Joining Error

I’m trying to join the DXP6800PRO to a Windows AD domain, but I’m having trouble because an error keeps popping up.

When I proceed via Control Panel → Domain/LDAP → Wizard, the error shown in screenshot1.png appears.

I clicked “Details,” and I entered the “Domain account” and “Domain password” in the format shown in screenshot2.png. (The content is just a placeholder! I’m using the correct credentials.)

I tried entering the “Domain account” in the format “hoga@domainname,” but that didn’t work either.

If anyone knows how to fix this, please help!

The System Version is 1.14.1.0.107.