Microsoft has updated how they handle a license. Specifically, how they handle licenses that bundle together multiple features.
At EN Computers, there are three common licenses our clients use …
Exchange Online Plan 1 – “stand-alone” e-mail only license
Office 365 Business Premium – bundle license that includes the Exchange Online Plan 1 feature
Enterprise E3 – bundle license that includes the Exchange Online Plan 2 feature
In the past, if a user with an Exchange Online Plan 1, was assigned an Office 365 Business Premium license -- the Admin portal would allow it.