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
244 votesAnonymous commented
This would be a very useful feature for our company managed mobile devices.