I logged a bug report here Unable to Delete Notification for an issue where I created a Onedrive account. The process gave me a notification that I needed to re-login - which I did successfully - but the account notification did not go away. Its still there 2 months later on the events screen and it is not possible to remove it through the Sailfish UI (see bug report).
Ok, so its not the end of the world, but it is irritating. Can I remove it manually be deleting an entry in some config or cache file somewhere? If so, how please?