Is SoapUI 5.3.0 free version supporting OAuth2 client credentials grant type?

Hi,

I am using SoapUI 5.3.0 free version. According to the release notes this should now provide support for client credentials grant type. I can select it from the Authorization drop down and provide correct data, but it always returns this error when trying to get the token:

Mon Apr 10 14:13:28 EEST 2017:ERROR:An error occurred [OAuthProblemException{error='invalid_request', description='Missing parameters: access_token', uri='null', state='null', scope='null', redirectUri='null', responseStatus=0, parameters={}}], see error log for details

Mon Apr 10 14:13:28 EEST 2017:ERROR:An error occurred [org.apache.oltu.oauth2.common.exception.OAuthSystemException: OAuthProblemException{error='invalid_request', description='Missing parameters: access_token', uri='null', state='null', scope='null', redirectUri='null', responseStatus=0, parameters={}}], see error log for details

Any suggestion or idea will be very helpful. Thank you.