Support multi MAM protected accounts per device/app
Most Microsoft apps support multi identities. Unfortunately, MAM only possible for one identity. Trying to logon to an MAN protected app with an identity from another tenant it shows message: 'The apps on this device are already managed. Only singe managed account is allowed on a device'
Erik Glockling commented
I believe Outlook already supports Multi-identity app protection policies (MAM) for iOS and Android. However, devices can only be enrolled with a single MDM authority.
We have a lot of companies who protect their data using MAM and the BYOD users that have a separate Outlook O365 account that are being protected by another Tenant, like a University, can't enroll the same device twice in separate MAM policies.