Sorry for the late response! We actually continued this conversation over email and the final resolution was to use a public channel (e.g. #general) in the Slack Webhook configuration.
Since the Slack Webhook channel is always overridden with the channels configured in Slack for Confluence, there should be no drawback using a public channel in the Webhook. However, it seems that when using a private channel in the Webhook, Slack for Confluence cannot send notifications to other private channels.
We've also enhanced our documentation to make sure this is no longer an issue.
Thanks @Matúš Klaudíny for bringing this up and helping us to find the solution!
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