Comprehension question: Custom tournament endpoint (Get)

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When I call /api/tournament I seem to only get tournaments created by "lichess". Because I created a tournament starting in about 40 minutes and I can't see it either at https://lichess.org/tournament nor using the /api/tournament-endpoint.

My questions:
How many items are returned? Is this fixed by count or time (plus x from now)?
How can I see other (custom) tournaments?

The description says:

This API is used to display the Lichess tournament schedule.

I wonder how this can be, because when I view the tournament page, I can see only one custom arena of one of my teams, but not the one created by me.
When I go incognito browser mode I can't see any custom tournament.
So it seems to me, that the custom team tournament is merged into the data of https://lichess.org/tournament
But how is the data retrieved?