Why are you 'Contacting Offfice 365' for a new email account?

Today set up a new independant email account. When I go to Accounts/Add account, and provide my credentials (to the new email provider), I get a dialogue, “Contacting Office 365…”

Why is eMail contacting Office365?
I killed the dialogue becuause I don’t want you to do that.

Help!?