Trying to get my app to log into google services fails every time

I am trying to set up IAPs for my app, but am running into issues. I have it set to check if the ID is logged into google play when the app opens. The external UI comes up, however, it will not log in successfully. My app is in closed beta for testing the IAPs currently, but I can’t even get to that point because it will not log in to begin with. Any help?