Ad join on windows 2012 r2 - failed

Hello, i’m new on true nas, i’m trying to add my true nas 25.10.3 community edition on my Windows2012 R2 AD

Also reading guide, this is the step i did
_ static ip on my nas
_ static ip on primary secondary dns
_ PTR created on DC DNS , replication to each DC is fine

dig -x [truenas ip] correctly respond , nslookup correctly resolve [truenas ip]
ping is fine,

i receive “Failed to discover Active Directory Domain Controller for domain”
fpr test purpose i try to enter wrong admin password but receive always “Failed to Discer AD”

Can someone help?
Thanks ffor helping!