Can't connect to O365 Mailbox via Outlook 2013/2016

One of my colleagues has trouble connecting to her O365 mailbox via Outlook 2013/2016. Can we get any advice on this?

1. Outlook 2016 (her own PC)

Start > Control Panel > Mail (microsoft outlook 2016) > Dialogue [Account Settings] > [New…] > Input Name, Email and Password > [Next] > The dialogue said it was “Completed”, but the account was not added in the list in [Account Setting] dialogue.


2. Outlook 2013 (my PC)

The dialogue said it was “Completed” and account was added in the list. However, Outlook didn't start up showing "Reading Profiles" for more than 10 minutes. (We gave up and closed it)

We would appreciate your help!