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@julien-sarriot What does turning on the debug log do? https://fusionauth.io/docs/v1/tech/admin-guide/troubleshooting#enabling-debugging has instructions on how to do that and where to look after (in the event log).
Please share that info here.
Yes, you can put anything in the user object that is documented here: https://fusionauth.io/docs/v1/tech/connectors/generic-connector/#using-the-generic-connector
You can return registrations which contain roles as outlined in the sample JSON in the link above.
Hope that helps!