Every time I do anything with O365 it pops a box making me select which account I want, listing both my real account and also a domain service account.
In the "Email & accounts" panel, I have both my normal work account as well as the extra service account (listed as "work or school"). Per MS documentation I should be able to click on it and then select "remove". However, the "remove" button does not exist for it. I only have a "manage" button.
I've tried logging into it on O365 (as I do know the password to it) and signing out of it, but it still remains stuck on my system.