No idea. But it looks like email is working, but the links in the email just have the ip address instead of the hostname?
That’s cool that you are using Azure. I would strongly consider you take the time to re-install your forum following our Official Azure install guide. This way you can get better support from the community since you will have a very similar install to everyone else, you will have the option to always upgrade to the latest version of Discourse (receive bug fixes), and have better plugin support.