The documentation mentions "Slack Notifications" link of a page in "https://community.atlassian.com/t5/Confluence-questions/View-Page-Information/qaq-p/895586 " and here "Use Slack and Confluence together | Confluence Cloud | Atlassian Support".
I am not able to find "Slack Notifications" link in anywhere.
So Slack cannot be configured, I pasted the error below.
Thanks & Reagrds
This would suggest it is not configured for this space yet. Check Space Settings -> Integrations -> Slack
If there is no option for that, then you probably don't have it enabled yet. Go to Admin -> Manage Apps and select "system" in the select list, and look for Slack in there.
There are a couple situations where the Slack settings are not visible in Confluence Cloud's space settings.
Daniel | Atlassian Support
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