Government Web Site is not Resolved

Hi, seems to work great for 99.9999% of sites:

este:~> host has address has IPv6 address 2607:f8b0:4007:802::2004

However, it does not work for this government web sites someone at my company needs access to:

este:~> host
Host not found: 2(SERVFAIL)

Yet, on this machine which is using  different resolvers

PLEIADES> host is an alias for has address

Any clue? Thanks!