How I managed to work around this to add a new Slack workspace:

* Click the + button in the desktop app. This opens 
https://app.slack.com/ssb/add?… in Chromium.
* Press F12 to get the Network tab. Make sure *Preserve Log* is checked.
* Type in the workspace URL and hit Enter.
* When prompted to run `xdg-open`, accept it. Nothing will happen.
* Look in the request *Name* column for the red request starting with 
`slack://` in the full URL displayed in the hover tip.
* Right-click to *Copy » Copy link address*.
* From a terminal window, type `xdg-open `, paste the link, and Enter

For Zoom it is usually less cumbersome since you can just open the Zoom
app manually and copy and paste the meeting ID from the URL displayed in
the browser, though this does not seem to work in all cases.

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to chromium-browser in Ubuntu.
https://bugs.launchpad.net/bugs/1776873

Title:
  Whitelisted allowedURLschemes breaks some desktop apps

Status in snapd:
  Triaged
Status in chromium-browser package in Ubuntu:
  Confirmed

Bug description:
  
https://github.com/snapcore/snapd/blob/7952972d4897e085030b288e44dc98b824f6723a/userd/launcher.go#L55

  snapd has a hard-coded list of allowed URL schemes. Currently that is
  limited to "http", "https", "mailto", "snap".

  We have a number of applications in the store which are trying to use
  protocol handlers outside this scope and break when that's not
  possible.

  e.g.

  Telegram Desktop: tg:/
  Github Desktop: git:/
  IRCCloud Desktop: irc:/

  These are the ones I know of, others may also be affected. Can we
  please at least expand the list to those that we know of, and perhaps
  research other popular protocol handlers?

  Ideally we wouldn't have a whitelist, because this delays our ability
  to land new applications with as-yet unknown url schemes.

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