So, web Outlook has had a bug with Single-Sign-On for many months now. It independently checks an own cookie, whether it should log you out, so it can happen that you log in via SSO and then it immediately triggers the logout flow of your SSO provider to log you back out.
Well, and when I say "can happen", I mean that this happens every single morning, unless I clear Outlook's cookies beforehand.
So, every morning before I start working, I hit Ctrl+Shift+H in Firefox to bring up the history, type "outlook" into the search, right-click an entry and then select "Forget About This Site" to clear the cookies.
Except, through the magic of doing this regularly, I've started typing just enough to make the Outlook entries appear at the top. Which isn't actually much shorter, but I noticed that I always just type "outloo".
Which sounds like a combination of "outhouse" and "loo". Which very much summarizes my feelings towards this Microsoft™ service, every time I have to do this. Which is every single morning. Fucking hell.