OIDC Auth Flow won't return ID Token

[BarryCarlyon]

Do the reverse of the id.twitch migration guide:

OAuth Kraken Migration

We’ve migrated our OAuth APIs to https://id.twitch.tv and deprecated the existing OAuth APIs under the Kraken namespace. When are these changes going live? It’s already live! The documentation for Twitch Authentication has been updated to reflect these changes. Moving forward, OAuth features, like new OAuth scopes, for the new Twitch APIs will only be available at https://id.twitch.tv. However, the Kraken APIs (i.e. https://api.twitch.tv/kraken) – including its existing OAuth APIs – are current…