Error: You’re currently signed in with an Office 365 email account, which can’t be used with Outlook.com.

I keep receiving this message every time i try logging into my outlook school account. I cleared cache, cleared cookies, tried using incognito mode and also tried using outlook.com/(myschoolname) but nothing has worked. I need to access my email asap for a school report which will soon be overdue due to the fact of my account not working. Please help.