[Samba] DNS entry missing after join to ad

[basti]

Hello,

i use samba4 with bind_DLZ and try to join dc3 to ad domain.

samba-tool domain join net.autohaus-loebau.de DC -U "administrator"
--dns-backend=BIND9_DLZ

is finished without errors but some srv records for dc3 are missing.

so i try
samba_dnsupdate --verbose --all-names

and get a lot of errors:

Failed nsupdate: SRV _kerberos._tcp.samdom.example.com
dc3.samdom.example.com  88 : [Errno 2] No such file or directory
...
Failed update of 28 entries

how can i force to add the failed records?