Problem
Schema State check has failed.
Solution
Both instances were linked back to DNS.
To prove that AD was healthy I ran the Prepare AD components directly from the DC (that works as usual)..which confirms that a DNS validation issue is present.So what's going on with DNS?
Fisrtly an NSLOOKUP on the Lync box reveals that the default DNS server is unknown, adding a PTR record for the DNS server solves that.
Secondly, the installer queries the SRV records for contacting the PDC in active directory. This SRV record is:
_ldap._tcp.pdc._msdcs. DnsDomainName
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