Journey does not trigger on user_created event

[mattes3]

I created a test journey that has an entrance for the user_created event:

When I POST on /identify, a new user named John Smith is created:

curl --request POST \
    --url 'https://email-automation.bohlenlabs.com/api/client/identify' \
    --header 'Authorization: Bearer pk_...' \
    --header 'Content-Type: application/json' \
    --data '{
        "external_id": "5",
        "email": "some@example.com",
        "timezone": "America/Chicago",
        "locale": "en",
        "data": {
            "first_name": "John",
            "last_name": "Smith",
            "has_completed_onboarding": true
        }
    }'

But when I open the user details of John Smith, the journeys tab is empty:

What can I do here?