Creating a new user / email address
We have Comcast Business managed Office 365 Business Essentials.
I need to create a new user (because, you know, new employee), so that I can assign that person to the Office 365 App.
When, through Comcast's interface, I create a user, it asks me for an email address so that the user can be sent an invitation. Except they don't have a company email address yet, because they are a new user (previously, this interface allowed me to create the user and assign the email address), and so the email goes nowhere. I can't create the user through the Office 365 interface, because the system is managed through Comcast.
So how do I now create a new user? FYI: I tried creating the user using a private email address (which worked), hoping that I could then change the user's email address to a company one (no such luck).