Works for iphone but not macbook

So, I have an Iphone on which this application works wonderfully well. But on my Macbook Pro with OS X EL Capitan V10.11.5, When I enter my credentials and start the connection, I always get the error :”The Requested session access is denied”. Tried looking it up on various forums online but to no avail.

SiyonaC about Microsoft Remote Desktop 8, v8.0.32