Related Post, but I’ve since contacted Let’s Encrypt regrading this error.

Kindly check this thread with LetsEncrypt’s support

I’m now getting the following error after running:
sudo certbot renew

IMPORTANT NOTES:
 - The following errors were reported by the server:

   Domain: www.howdenaces.com
   Type:   dns
   Detail: DNS problem: SERVFAIL looking up CAA for www.howdenaces.com
   - the domain's nameservers may be malfunctioning

But the thing is, I’ve already added in the CAA record to allow letsencrypt.org, and my records are correct.

They’ve also informed me that there’s something odd with my NS records. I did have two extra NS records before but I’ve since deleted them over 6+ hours ago. I don’t think the DNS has been refreshed since the LetsEncrypt support informed me that there’s still something odd about the NS records.

You can try running: dig +trace www.howdenaces.com

and the following log will appear:

www.howdenaces.com.     60536   IN      NS      ns1.digitalocean.com.
www.howdenaces.com.     60536   IN      NS      ns2.digitalocean.com.
;; Received 96 bytes from 198.41.222.173#53(ns3.digitalocean.com) in 108 ms

www.howdenaces.com.     60536   IN      NS      ns1.digitalocean.com.
www.howdenaces.com.     60536   IN      NS      ns2.digitalocean.com.
;; BAD (HORIZONTAL) REFERRAL
;; Received 96 bytes from 173.245.58.51#53(ns1.digitalocean.com) in 148 ms

www.howdenaces.com.     60536   IN      NS      ns1.digitalocean.com.
www.howdenaces.com.     60536   IN      NS      ns2.digitalocean.com.
;; BAD (HORIZONTAL) REFERRAL
;; Received 96 bytes from 173.245.58.51#53(ns1.digitalocean.com) in 196 ms

www.howdenaces.com.     60535   IN      NS      ns1.digitalocean.com.
www.howdenaces.com.     60535   IN      NS      ns2.digitalocean.com.
;; BAD (HORIZONTAL) REFERRAL
;; Received 96 bytes from 2400:cb00:2049:1::adf5:3b29#53(ns2.digitalocean.com) in 196 ms

howdenaces.com.         3600    IN      A       128.199.142.171
www.howdenaces.com.     43200   IN      CNAME   howdenaces.com.
;; Received 77 bytes from 2400:cb00:2049:1::adf5:3b29#53(ns2.digitalocean.com) in 196 ms

Can this issue be fixed immediately? Thank you.