2 votesChris B. commented
Agreed, we had to create a PowerShell script to perform this action but it should be native to the platform. Upon user account creation / group assignment Intune should query a user's enrollment status and send automated "Welcome" emails both initially and on a set schedule until the end-user properly enrolls. Post deployment we've had to chase new hires to make sure they've completed the process.
In addition there needs to be some type of compliance report (manual or scheduled) which will inform us of account missing registration. Again we've done something similar with PowerShell but this is a basic admin function which is missing and included in every other IdP's product line.