ConfigHandler has already been started

Summary: ASP.NET Core app seems to work fine locally, but when deployed to Azure, I'm getting "ConfigHandler has already been started" exception message.

Repro:

1. Deploy this project to Azure Web Service - https://github.com/mgroves/MattsTwitchBot
   1. manually is fine
   2. debug mode
   3. I've pasted what I think are the relevant pieces of code below and logs
   4. if nothing jumps out as a problem, let me know and I will create a more minimal example
2. Open website

Excepted:

Website to work without exception

Actual:

404 error from website, exception in log (attached)

Notes:

This seems to work just fine locally. The problem only seems to happen when deployed to Azure Web Service. Maybe a race condition?

Code snippets:

Jira formatting is horrible, so I attached it too.