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 commentNathan commented
When a device is enrolled in Intune and conditional access is turned on, it should be possible to have multiple email accounts configured on the enrolled device. Currently, only the email account that matches the user that was used to enrol the device can be configured.