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Works for me on Kubuntu 22.04. Note that the link above directly goes to the error page.

Yeah, I logged in and it still gave the error page after routing to /#go. Same happens on my Fedora machine.

Firefox has been blocked entirely for at least a year now, in my experience.

so is this the ie11 user agent matching thing?

No, there is something wrong with their browser detection. Teams supports Firefox, Chrome and Edge https://www.microsoft.com/en-us/microsoft-365/roadmap?filter...

What if you fake the user agent?