[ms office - o365] Outlook 365 not using exchange - new staff only

[Wired_Inside_90]

Hi,

 

We are having an issue in which new staff are getting a microsoft 365 inbox rather than their exchange one. They can access emails through webmail which is fine but when setting up outlook 365 it's just blank or in some cases it will have the Microsoft Viva welcome email. All the licenses seem correct ( A3 faculty license)

 

I'm at a bit of a loss on what to do. I've tried creating a new profile etc but that hasn't worked. Made sure to choose exchange as the option etc.

 

Has anyone had similar issues?

 

Thanks