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I'm not sure what i'm doing wrong but I have an Oauth2 setup that tests successfully and is mapped as "access_token" as per the default.  

Under Custome Header Parametrs i've added "Authorization" under name and "bearer access_token" under value and I get a 401 error.  If i Copy the token that shows when I run the test in the Oauth2 tab and baset it in place of "access_token" in the value column the data shows up fine.  For some reason i'm not able to get hte token to pass through as mapped data.  I've tried using different variations of what i called hte mapped data but nothing seems to work.