I'm using a control panel to manage my site (no, or provide the name and version of the control panel):
k8s cert-manager
I'm getting this error:
Error accepting authorization: acme: authorization error for
uat.car-insurance.atlantic.caa.ca: 400 urn:ietf:params:acme:error:dns: DNS
problem: NXDOMAIN looking up A for uat.car-insurance.atlantic.caa.ca - check
that a DNS record exists for this domain
It does look like one problem is that ns3.rts.caa.ca. isn't reponding for caa.ca.
But the authoritative servers (looking to be hosted by dnsmadeeasy.com) are all returning NXDOMAIN for uat.car-insurance.atlantic.caa.ca, at least according to DNSViz.