Thanks for the help.I was under the impression that only_subdomains was needed because I was using duckdns.org. However, after I removed my existing container, recreated it with the same settings, except for changing only_subdomains to false, I am having the same problem.
Update: It's working
So, I setup my docker using a guide that took me 90% of the way, but the last 10% is what I needed. After replying to aptalca, I stepped back and looked at everything I was doing and decided to work through on my own, one step at a time, and the culprit ended up being a bad default file. I should have known better. Thank you for the help.