Discovery works from Windows laptops, but Chromebooks fail with what looks like DNS issues. Logs below. 

Setting 'wins server' in smb.conf works, but needs the WINS server IP. Does DHCP provide the WINS server?
Possible workaround: Set WINS IP in enrollment screen.

resolve_ads: Attempting to resolve DCs for <REALM> using DNS
dns_send_req: Failed to resolve _ldap._tcp.dc._msdcs.<REALM> (Success)
ads_dns_lookup_srv: Failed to send DNS query (NT_STATUS_UNSUCCESSFUL)
Adding 0 DC's from auto lookup
get_dc_list: no servers found
ads_find_dc: name resolution for realm '<REALM>' (domain '') failed: NT_STATUS_NO_LOGON_SERVERS
ads_connect: No logon servers
sitename_fetch: No stored sitename for realm '<REALM>'
resolve_and_ping_dns: (cldap) looking for realm '<REALM>'
get_sorted_dc_list: attempting lookup for name <REALM> (sitename NULL)
saf_fetch: failed to find server for "<REALM>" domain
get_dc_list: preferred server list: ", *"
internal_resolve_name: looking up <REALM>#1c (sitename (null))
no entry for <REALM>#1C found.
resolve_ads: Attempting to resolve DCs for <REALM> using DNS
dns_send_req: Failed to resolve _ldap._tcp.dc._msdcs.<REALM> (Success)
ads_dns_lookup_srv: Failed to send DNS query (NT_STATUS_UNSUCCESSFUL)
Adding 0 DC's from auto lookup
get_dc_list: no servers found
ads_find_dc: name resolution for realm '<REALM>' (domain '') failed: NT_STATUS_NO_LOGON_SERVERS
ads_connect: No logon servers
Didn't find the cldap server!
return code = -1
msg_dgm_ref_destructor: refs=(nil)
Exit code: 255
net ads workgroup failed: network problem
JoinADDomain failed with code 19