Cannot setup MS O365 email account on outlook, because cannot pop-up login screen / keep ask password.
Solution:
Open Windows Registry
Goto Computer\HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\Identity.
Create a new DWORD named “EnableADAL” and give it a value 1
Create a new DWORD named “DisableAADWAM” and give it a value 1
Create a new DWORD named “DisableADALatopWAMOverride” and give it a value 1