Enable "Dual messenger" feature on Samsung devices in Intune

We are using Samsung knox and microsoft intune to deploy a bunch of smartphones. 

Everything went well, but there is an option that is apparently blocked form use.
This is called "dual messenger" which means, if supported by the app you can run multiple instances of it.

This is a requirement for users who want to use the phone with their private cell / dual sim.

However, when trying to enable this, it says there are device restrictions in place that prevent the use of dual messenger.

I've been searching everywhere, and only found something that says : DISALLOW_ADD_MANAGED_PROFILE
but I cannot find any setting in Intune that might help with that.

Has anyone figured out how to allow the use of the dual messenger feature in Samsung phones ?