When logging into Office 365, check you are logging into the legitimate Office 365
Check the address bar
The address should start with https, have the padlock, and be as shown.
Enter your email
DO NOT ENTER YOUR USERNAME
AND PASSWORD ON THE SAME
When entering your password, check to see:
Can you see the Lourdes IT logo?
Can you see the Lourdes IT wallpaper?
Is the address bar still showing the same start as shown above: