For the authentication process to work, you will need to create a dev-only Discord OAuth Application at https://discord.com/developers/applications. It should look something like this:
Take the ClientId and Client Secret and in Visual Studio, right click the "WanderLost.Server" project and select "Manage Secrets" in this file add the "DiscordClientSecret" and "DiscordClientId" to the file:
In Visual Studio, select WanderLost.Server as your startup project and hit run
Alternatively from the command line you can use dotenet run in the WanderLost\Server folder then launch open the site from your browser.