Help with delegation

[Michael Barber]

I am having a problem researching a domain delegation issue.  Thanking in
advance for any help.
 
I'm trying to delegate the entire *.preview.web-hosters.com to a secondary
location which will/should be running dns as n3.hostingplatform.com
 
Heres the operative part of my named.zone
 
zone "preview.web-hosters.com" {
 type master;
 file "_db_WEBHOSTERS.zone";
};

Here's my zone file.  I removed the glue record because it was logging an
ignored message in my logs and was not mirring the glue record to the slave.
 
; ComCity DNS File _db_WEBHOSTERS.zone
$TTL 3600
;$ORIGIN preview.web-hosters.com.
@ IN SOA ns3.hostingplatform.com. hostmaster.comcity.com. (
2005061006 ;ComCity Serial
10800  ; refresh
900  ; retry
604800  ; expire
3600)  ; minimum
 
  IN NS ns3.hostingplatform.com.
  IN NS ns4.hostingplatform.com.
 
;glue record for hostingplatform ns
;ns3.hostingplatform.com.        86400    IN    A    205.178.132.60
;ns4.hostingplatform.com.        86400    IN    A    205.178.132.61
 

One of the hosts under this domain is 0000025.preview.web-hosters.com.  When
I do a lookup at dnsstuff.com, I get this


DNS Lookup: 0000025.preview.web-hosters.com A record
Generated by www.DNSstuff.com
How I am searching:
Searching for 0000025.preview.web-hosters.com A record at m.root-servers.net
[202.12.27.33]: Got referral to D.GTLD-SERVERS.NET. [took 204 ms]
Searching for 0000025.preview.web-hosters.com A record at
D.GTLD-SERVERS.NET. [192.31.80.30]: Got referral to ns2.comcity.com. [took
135 ms]
Searching for 0000025.preview.web-hosters.com A record at ns2.comcity.com.
[209.10.62.39]: Reports that no A records exist. [took 87 ms]

Answer:
No A records exist for 0000025.preview.web-hosters.com. [Neg TTL=3600
seconds]

Details:
ns2.comcity.com. (an authoritative nameserver for preview.web-hosters.com.)
says that there are no A records for 0000025.preview.web-hosters.com.
The E-mail address in charge of the preview.web-hosters.com. zone is:
hostmaster at comcity.com.

However:

_____

I have no direct control over the *.hostingplatform.com zone.  Its being run
by someone else. 
Its not working....Is it possible to tell why or what I need to do to fix
this?  
Why does dnsstuff.com report that ns2.comcity.com is authoritative?