I had exactly the same problem, however I was not able to resolve it until I tried a different browser.
After many attempts and a couple of wasted hours I came to conclusion that for some reason my beloved Firefox did not allow me to successfully complete the Slack "/confluence login" command. I tried disabling both uBlock Origin and Ghostery, tried switching to Private mode, all to no avail.
Then I tried the same in the new Edge (InPrivate window) and it worked!
After this initial login in another browser I am now able to submit Slack "/confluence connect" commands sucessfully in Firefox! It seems that Firefox only has issue with the initial login.
Hope this helps.
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