Create new Office 365 user option is missing

Create new Office 365 user option is missing

This button used to have a select menu with multiple functions, one of which was to create a new user from our Office 365 account. This would essentially allow single sign on for Zoho with Office 365. I used this function last week. Today the function is missing. Nothing has changed that I know of. I have cleared browser cache and cookies. I have tried Firefox and Chrome.