Authentication Sample Bot does not let me authenticate in Microsoft Teams

Question

I try to get the Authentication Sample Bot to work. When I use the Bot in Microsoft Teams, the OAuthPrompt seems to render correctly:

but when I click the button, nothing happens. I see this in the console:

Why doesn't this work?

Answer 1

Just creating an Azure Bot Service 'Bot Channels Registration' is not enough to use bot authentication with Microsoft Teams. You have to have a manifest file zipped and uploaded as a custom app into Microsoft Teams. In that manifest file you have to specify the domain of the Bot Framework token endpoint:

"validDomains": [ "token.botframework.com" ]