example.com cannot be resolved. The DNS zone is configured correctly in Plesk Automation, the query as below returns correct IP:
# dig +short example.com @ns1.isp.tld 172.16.0.11 # dig +short example.com @ns2.isp.tld 172.16.0.11
ns2.isp.tld are Plesk Automation DNS service nodes.
The domain for some reason was put on hold on registrar side.
Run the following command in order to check domain status:
# whois example.com |grep -i 'Domain Status' Domain Status: clientHold Domain Status: clientTransferProhibited Domain Status: clientUpdateProhibited
the status clientHold indicates that the domain was suspended on registrar side. You can find more details at ICANN EPP status codes page
Contact domain registrar in order to clarify the reason why the domain was suspended. The registrar contact can be found in full
# whois example.com