David665well okay, but that's zero helpful. That's not even enough to differentiate with.
In Firefox, where I can at least say to permanently accept all cookies from http[s]://login.microsoftonline.com and have already signed into the Office365 services, it doesn't ask me.
But in the Teams client, where I have to sign in separately because the client is just a customised front-end on a browser (specifically "--user-agent=Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) MicrosoftTeams-Preview/1.3.00.25560 Chrome/69.0.3497.128 Electron/4.2.12 Safari/537.36"), I CAN'T tell it how to treat cookies.
The only setting I can see which looks even vaguely like a Chrom[e/ium] flag is GPU Hardware acceleration under "Settings / General".
The only settings available give no option for handling cookies or even admit that cookies are a thing. I can't upgrade because that's straight from the packages.microsoft.com/repos/ms-teams stable repository.
And every time I sign in, the damned thing mocks me with its constant lie of "Stay signed in? (Don't show this again)". I can't even skip this stupid screen that very evidently doesn't work anyway.