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Jorge Ponce 9Jorge Ponce 9 

I Can't input CreatedById during feed item creation from rest api call.

I was able to do this two weeks ago.  Here is the code that I've been using with prior success.  This is made from a connected app.
https://resolvesystems.my.salesforce.com/services/data/v45.0/sobjects/FeedItem
{
    "ParentId": "5001T00001FDbCkQAL",
    "CreatedById": "0051T000008HQj3QAG",
    "Body": "I've tried to replicate in 6312 and the issue didn't happen there. I suggest we pause this case until we upgrade our demo environment which should be done shortly."
}

 
Jorge Ponce 9Jorge Ponce 9
Found my own issue.  It seems the profiles using the app now need to have the permission to be able to edit there own post.  Figured it out.