DNS Problem for new creation

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My domain is: knowledge.thompsonavc.co.uk

I ran this command: sudo certbot --apache -m admin@thompsonavc.co.uk -d knowledge.thompsonavc.co.uk -d www.knowledge.thompsonavc.co.uk

It produced this output:

Important Notes:
-The following errors were reported by the sever:
Domain: www.knowledge.thompsonavc.co.uk
Type: None
Detail: DNS problem: NXDOMAIN looking up A for www.knowledge.thompsonavc.co.uk

My web server is (include version): Apache 2.4.29

The operating system my web server runs on is (include version): Ubuntu 18.04.1 LTS

My hosting provider, if applicable, is: n/a - locally hosted

I can login to a root shell on my machine (yes or no, or I don’t know): yes

I’m using a control panel to manage my site (no, or provide the name and version of the control panel): n/a

You should create a DNS record for www.knowledge.thompsonavc.co.uk.

knowledge.thompsonavc.co.uk has this A record:

knowledge.thompsonavc.co.uk. 3600 IN    A

But www.knowledge.thompsonavc.co.uk doesn't exist.

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I have already setup an A record on our DNS server for this to work internally. Should the record be setup on the web sever its self? Domain points to external IP.

Let's Encrypt's validation servers are external to your network. The record needs to exist on your Internet-facing DNS.

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