TTS up and running again. This solved it for me.
https://community.home-assistant.io/t/nginx-and-duckdns/262579
Then follow the dummylabs guide posted by Mackan.
If you get “400 bad request” when testing “basic HTTP access”.
https://community.home-assistant.io/t/home-assistant-400-bad-request-docker-proxy-solution/322163