You are receiving the error: “You’re currently signed in with an Office 365 email account, which can’t be used with Outlook.com” because of the following reasons:
Your Microsoft account was registered or still registered in Office 365.
Your Microsoft account ends with .edu domain extension name and is being managed by your University domain administrator.
Please follow the instructions below to prevent receiving the error message when accessing your account.
Make sure that you are using a different browser or try InPrivate Browsing (IE) / Incognito mode (Chrome) as this will keep your sessions separate and at least allow different sessions per window. You can visit this link for additional reference.
Try to log into http://mail.office365.com
If your Microsoft account was registered or still registered in Office 365:
Make sure that you’re signed out from any Microsoft services.
Optimize your browser by clearing its cache and cookies. You may follow the instructions in thislink on how to do it.
Then, sign into your account through this link: https://login.microsoftonline.com/ . You should not encounter the error message again.
still need assistance(remote or live) to resolve the issue initiate the chat.