Confirmed that it is currently by design that conditional access allows only one identity per device at this time. We hear that you need this and we’re looking into it. I’ve changed the title and category to indicate that this is related to conditional access.
Again, this is just for multiple identities from the same company. If you’re looking for having one device with identities from two different companies for MDM, that idea is here:
And if you’re looking for having multiple identities for MAM, that idea is here: https://microsoftintune.uservoice.com/forums/291681/suggestions/34627435
An error occurred while saving the commentanonymous commented
Why would an intune admin need to be involved at all? If Kathy has rights to manage Sue's email, she should be able to "open another mailbox" just like in OWA, or add a "shared folder" with no additional intune admin intervention. Sue has already given Kathy rights to her calendar/inbox. This is basic functionality that is in OWA. It should work on devices, too.