I always thought that a Microsoft account is either a Personal one (created at Hotmail, msn.com, outlook.com, etc) or a Workplace/School one (eg created at portal.office.com).
I am trying to add an account: user@somedomain.onmicrosoft.com (created at portal.office.com) to log in to a Windows 10 Pro PC. But it says "Looks like this isn't a Microsoft account. Try another email or sign up for a new one."
Does this mean that for small businesses or home use, users have to log in to the PC with one Microsoft account while using another separate one to manage their Office 365 licenses?