Support login.microsoftonline.com in addition to login.live.com for institutional / cloud Microsoft accounts

So I use a Microsoft account for school and to acces my school mail I needed to login the account. It worked fine on the outlook.com website itself or trough my Mail app Geary directly. If I try to do it trough gnome online accounts it shows the login windows but once I enter my mail it says: "That Microsoft account doesn't exist. Enter a different account or get a new one."

Sidenote: I also have my personal MS account logged in