With Windows 10 we have the possibility to change Windows 10 Mobile into Windows 10 Mobile Enterprise.
I can be done with a provision profile or a Intune CSP policy.
I will show how it is done with a Intune CSP policy:
Create a new Configuration Policy
Select “Custom Configuration (Windows 10 Desktop and Mobile and later)”
Use the OMA-URI Settings
Add the correct settings as descripted – download the mobileenterprise.xml from Microsoft VMLS site
Deploy the policy
Select your target group
Now it is time to test the policy on a device.