Hi, we manage our users's iPhone devices via Intune. Is it possible to enroll the device, then have 2 different Office 365 accounts login to Outlook for iOS app? We require the CEO and CFO's assistant to be able to access their boss's mail, calendar as well as their own.
Do you mean that you want to the CxO and the CxO-assistant to share an iPhone - like the CxO passes her/his phone to the assistant and says "free up some time next Thursday for a meeting with company".?
Unless you really mean that they would share the phone, you probably want the outlook client being managed with MDM/MAM to support delegated access to other mailboxes. I.e. have CxO-assistant read bosses email and manage the calendar while logged in as the assistant.
Of course if the assistants are not restricted to iOS - say they carry/use a tablet or PC then you could use full Outlook 2016 with either multiple mailboxes open (using delegation) or using multiple profiles with two logins, or use web mail with multiple browsers - one for CxO and one for assistant's mailbox.