Unauthorized Error when trying to use Sharepoint 2013 REST from workflow

Hi guys,

I'm trying to set a workflow in my own site which uses "/My/Feed/Post" endopint of REST to post a newsfeed item. Then I got an error said "code":"-2147024891, System.UnauthorizedAccessException". I've been spenting much time on google and I found this: http://msdn.microsoft.com/en-us/library/jj822159.aspx

But it still didn't solve my problem as my site is not an "App" but a "site". I'm still getting UnauthorizedAccessException.

How should I configure my site to give workflow permission to post a newsfeed? Or how should I set the workflow?

Thanks for everyone in advance.

Michael

Make you laugh.