Azure bot is not calling the Cloud Function endpoint

[manmat]

After successful deployment of the bot backend in cloud functions I provide the HTTP trigger in the Azure bot configuration. After that I proceed to test it through the Web Chat but I get no response (no errors or warnings either) and the cloud function logs show now incoming request or cloud function invocation. Is something missing from the readme?

[manmat]

Looking at the channels in Azure I found the following issue log message: There was an error sending this message to your bot: HTTP status code Unauthorized

I figured that I had to add allUsers as function invoker.