Hi there and welcome
Can you tell me please to which email service you are trying to connect outlook to?
Please let me know
ok, thats the email service, so it is supplied by your company,
If it is saying authentication error then this is an issue with the username or the password, this is what it is referring to.
Does the company have a webmail system so we can get the correct password?
ok, what is the part of the email address after the @ symbol?
and which settings are you using (do not list email or password ***** everything else please) eg: incoming and outgoing server and ports.