Hi guys.
I've copied elements from a sharepoint list (call it SourceList) to another (DestList) with a simple flow. and it works fine.
As u know, in DestList the author as the creation_datetime are not sync cause they depend from the owner of the flow.
I found this video to edit this fields:
(3) Get and update SharePoint list item using Power automate Http REST call l Parse Json l MS Flow - YouTube
but i'm facing a problem with the POST Method. As Author, I have the AuthorID property and it seems that the body of my HTTP request is not legit.
Actually i saved correctly the AuthorId of the SourceList in a variable, this is how I set the request:

I tried also:

But its not working.
Some suggestions?
Thanks.