Embedding Power Bi

I am new to power Bi, I was working on the sample application to Embed Power Bi reports to App. I tried changing the base uri in the sample to get reports designed by us i.e from https://api.powerbi.com/beta/myorg/ to https://msit.powerbi.com/groups/ when I tried doing that I ran into an error saying there was a problem in signing in. Can you please suggest on how to do this or if I am doing something wrong.