There is a video that shows how to set up Social-login with Turnkey available here. There are a few additional pieces of information you may need to get the google login to work.
#1 In the https://console.developers.google.com you must enable the Google+ api – this is not added by default.
- https://<YOUR TURNKEY APP NAME>.azurewebsites.net/signin-google
- https://<YOUR TURNKEY APP NAME>..azurewebsites.net