[Python] How to authenticate a user when reporting a custom_event using python in appinsight

I am trying to trigger a custom event in a python application to record a system action linked to a specific user.

Our front end application provides a user_Id and user_AuthenticatedId to app insight and I want to populate the later at least in the backend side somewhere (I don't have access to the operations etc, only the UserId)

The only code I got functioning do trigger the custom event

from azure.monitor.opentelemetry import configure_azure_monitor
from azure.monitor.events.extension import track_event

configure_azure_monitor(
disable_offline_storage=True,
logger_name="telemetry"
)

def my_actual_function():
...
track_event(
"test-custom-event",
{
"user_AuthenticatedId": "toto",
"user_Id": "1111000003333",
"data": json.dumps({"test": 'OK'}),
}
)
...


but there is no linked user in app insight, in the first line corresponding to my "test-custom-event" the user columns are empty

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