When logging into your Office 365 account (email account) moving forward you may get prompted for a Duo Authentication. If you are in one of the company offices the Duo authentication will get bypassed, but if you are not in the office there will be one more step to logging into your Office 365 account. The login screens may also look a little different than they used to as well.
Here is the procedure to login on your phone after a password change and NOT in the office.