Microsoft Teams and disabled Third Party Cookies in Firefox

"To open the web app, you need to change your browser settings to allow third-party cookies." - Microsoft Teams

For all the poor souls out there, who are obliged to use Microsoft Teams or Office 365 and are struggling with the third party cookies, here's how I got it to run.

If you have third-party cookies disabled (which you absolutely should do), most of the M$ logins are not working. After numerous redirects you end up on a page like this:

Too many redirects and then you still end up here

Bummer. Reason is, that despite you are on teams.microsoft.com, login happens via a different domain (why do you do this?!??)

Setting a Cookie exception for https://login.microsoftonline.com worked for me


Don't let yourself be pushed to allow third-party cookies. That's a horribly bad idea for your online privacy and security. If you do that, you dramatically increase the attack surface for tracking and side-channel attacks. Don't do that, neither as a user or as someone who develops those online portals - others also manage to do this without a crazy amount of redirects over different domains, there is no excuse for doing so.

2 thoughts on “Microsoft Teams and disabled Third Party Cookies in Firefox”

  1. Not working for me. More URLs to add? Maybe one of my plugins from privacytools dot io is blocking it?

    1. Hi Bruno!

      Could very well be that one of the privacy-extenstions is causing trouble. You could try to disable them and one by one enabling them until you find out which one.
      I would be more than happy to add some extensions that cause trouble to the article, if you want it to share 🙂

      Best,
      Felix

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