Inserting reels on facebook page

Hello Everyone, has anyone tried to embed Reels on Facebook via API (Reels Publishing - Video API - Dokumentation - Meta for Developers) I have a problem with Step 2. I get error 400 what could be the reason?

Hey @Max_T,

A 400 error normally means the request is bad so it could be that the data you are sending is not what Facebook is expecting. It might be worth sending the request to something like to see if it looks like what you would expect.

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