Can not access email through outlook / hotmail anymore

I have used outlook/hotmail as my university email server (@uni.sydney.edu.au) for the past 5 years, but in the last 3 days every time I try and sign in it come up with an error and I can not access my account. The error states that I am trying to sign in from a outlook 365 account. When I try to log in to outlook 365 it says it's not recognised. It is essential that I access my emails ASAP, so any help would be appreciated. I've tried accessing it on different computers to be sure it's not my device / connection. Thanks.