I have configured NERM to automatically created the schema and sync the profiles using the Non Employee Risk Management default source (Non-Employee).
Under Admin > System > Identity Security Cloud Connection Settings, I configured all the required attributes according to the documentation - Profile types: End User (person) and contract(assignment). But the assignment accounts are not correlated to the identities instead they are created as identities.
How do you have your identity profile set for this source? The way we have set up NERM in the past is using Web Services Connector and we had to set up 2 sources one for the Non Employee Profile and one for the assignments and then built the correct collation logic.
Are you able to share more about how you have this configured?