I am having an issue logging into my school account using University 365

I bought University 365 a week ago and used my university account. Now every time I try to login into this account to check emails it won't let me and brings up an error page that states "You're currently signed in with an Office 365 email account, which can't be used with Outlook.com. Please click here to sign out of your Office 365 account, then use another Microsoft account to sign in to Outlook.com (for example, your hotmail.com, live.com, or msn.com account)." What do I do? I really need to get into this account ASAP.