It seems there is some DNS accessibility problem with your domain:
[2 of 4 tests failed]
C:>nslookup -q=txt _acme-challenge.mentalhealthatwork.nsw.gov.au 8.8.8.8
Server: dns.google
Address: 8.8.8.8
Non-authoritative answer:
_acme-challenge.mentalhealthatwork.nsw.gov.au text =
“lHL8joAs2FrQxwH9RRxp3nHQESRTRKXBTFwdiWVPqCs”
C:>nslookup -q=txt _acme-challenge.mentalhealthatwork.nsw.gov.au 1.0.0.1
Server: one.one.one.one
Address: 1.0.0.1
Non-authoritative answer:
_acme-challenge.mentalhealthatwork.nsw.gov.au text =
“lHL8joAs2FrQxwH9RRxp3nHQESRTRKXBTFwdiWVPqCs”
C:>nslookup -q=txt _acme-challenge.mentalhealthatwork.nsw.gov.au 4.2.2.2
Server: b.resolvers.Level3.net
Address: 4.2.2.2
*** b.resolvers.Level3.net can’t find _acme-challenge.mentalhealthatwork.nsw.gov.au: Server failed
C:>nslookup -q=txt _acme-challenge.mentalhealthatwork.nsw.gov.au 208.67.222.123
Server: resolver1-fs.opendns.com
Address: 208.67.222.123
DNS request timed out.
timeout was 2 seconds.
DNS request timed out.
timeout was 2 seconds.
*** Request to resolver1-fs.opendns.com timed-out