Since we started to use IS a few years ago, I was able to manage to add new users using their personal email and, after they login for the first time, I was able to change the email field (on users admin) to a common mail box. My customer service team, for example, don’t want their personal email to be disclosed to customers, so everyone use the customerservice@ mail box as their signature email but login with their personal email.
All was going well until today. When I was adding a new user - surprise! - “Invalid Email, the email: firstname.lastname@example.org is linked to another user”
Does anybody know why is this happening now?