Problems with Zoom SSO - Redirection from browser to Zoom doesn’t work

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1

Hi everybody,
I’m trying to sign in to Zoom using my SSO login from the university.
When I click on “Sign in with SSO” and enter my domain, the browser opens correctly, and I can log in via the SAML page of my university.

Then I am redirected to a “success” page, where the user should click a “Launch Zoom App”-Buttom

In theory if I press the button Zoom should open and process my token.
Unfortunately in Firefox or LibreWolf, my default browser, nothing happens, no matter how often I press the button.

my .local/share/applications/Zoom.desktop is

[Desktop Entry]
Categories=Network;Application;
Comment[de_DE]=Zoom Video Conference
Comment=Zoom Video Conference
Encoding=UTF-8
Exec=/usr/bin/zoom %U
GenericName[de_DE]=
GenericName=
Icon=Zoom
MimeType=application/x-zoom;
Name[de_DE]=Zoom Workplace
Name=Zoom Workplace
Path=
StartupNotify=true
StartupWMClass=zoom
Terminal=false
TerminalOptions=
Type=Application
X-KDE-Protocols=zoommtg;zoomus;tel;callto;zoomphonecall;zoomphonesms;zoomcontactcentercall;
X-KDE-SubstituteUID=false
X-KDE-Username=

I am on Wayland.
Does anyone know how to make SSO login work?

2

I remember I needed to use Chromium in order to get it to work for me.

1 Like
3

This might be a question on what the browser is trying to do and how it was installed.

For example if the browser is installed as a distribution package, a Flatpak or Snap.

Could also be a configuration issue.

For me clicking a Zoom URL and have it opened by Firefox worked until some day and I have not yet figured out why it no longer works.
I am using Chrome essentially just for that

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4

I figured it out - at least for my setup…

In my case, Firefox (or LibreWolf) no longer asks whether to open the Zoom app when clicking the “Launch Zoom App” button.

This is what I did:

  1. Open a new tab in Firefox and go to: about:config
  2. In the search bar, type: network.protocol-handler.expose.zoommtg
    • If the entry exists: Set it to false (right-click → Toggle or Reset). This will make Firefox prompt you the next time a zoommtg:// link is triggered.
    • If the entry does not exist, you can create it manually:
      • Right-click anywhere → New → Boolean
      • Name: network.protocol-handler.expose.zoommtg
      • Value: false

The next time you click on a Zoom SSO “Launch App” button that points to a zoommtg://... link, Firefox will ask again if you want to open the Zoom application.

That worked for me.
thx everybody

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