Azure AD administrators should be able to assign a reserved alias to a new group. At least, that’s what the documentation says. As it turns out, this isn’t strictly true as there are places where administrative interfaces (GUI and PowerShell) block any attempt to use reserved aliases. Does this matter? Probably not, unless you like consistency… which we do!
https://office365itpros.com/2021/08/30/nconsistency-dealing-with-reserved-email-aliases-in-microsoft...
