VCF installer DNS errors

So I’m trying to do a brownfield deployment with the 9.0.1 VCF Installer, and I can’t seem to get past The validation checks. It keeps throwing a dns error saying “Domain ‘sddc-manager-hostname’ in DNS Specification in DNS specification is invalid. Remediation: Provide valid FQDN for Domain 'sddc_hostname' in the DNS specification”

This article: https://knowledge.broadcom.com/external/article/418814/vcf-installer-deployment-failure-at-vali.html

Is the only article I can find referencing this error however the resolution is extremely vague and the cause is stated is this:

DNS resolution issues in the environment.

An example of such an issue is that an nslookup on the IP that the SDDC Manager fqdn resolves to does not return the same fqdn.

Except nslookup does return the correct fqdn for the sddc-manager. All dns lookups and resolutions seem to be working fine.

Anyone seen this and resolved it?