Domain is: x
Web server is: Nginx (latest, 1.19.3)
Hosting provider is: Vultr private VPS
Operating system of VPS is: Ubuntu 18.04 x64
Can login to a root shell on my machine: yes
Have a handful of Google domains and have had no issues with getting Let's Encrypt to generate certificates using the same shared nginx-proxy and letsencrypt-nginx-proxy-companion setup. Therefore I am assuming, for now at least, this is an issue with how I have the domain configured through Namecheap.
Seeking assistance on how to further triage the issue I'm encountering, having exhausted my limited knowledge and searching through these forums and others.