Hi MalwareBytes hpHosts,
Your Website/Domain scanning engine/dataset has flagged the login url for Office365/Azure http://login.microsoftonline.com/ as Malicious.
This is causing an interruption for logins to resources that use Microsoft Azure Active Directory as their login provider (login.microsoftonline.com). This includes Microsoft Office, Azure and many big services. Please correct the false positive on your end at the earliest.
Looking to hear back from you.
Microsoft Identity Domain Protection Team