API - Schedule Layout/Overlay/Campaign issue

I want to schedule an layout, overlayor campaign via the API, but I’m getting result 422 in any case.
Can someone maybe send me a postman example to schedule something to a display group?

displayGroupIds[0] was the solution

I’ve had the same issue, in the /schedule/data/events request as well. For the create/edit schedule requests in Postman, there are already two displayGroupIds params given, yet both with just displayGroupIds as names. Maybe it would make more sense to change these to displayGroupIds[0] and displayGroupIds[1] respectively?