Authentication in Google Play Services is not working

I added Google Play Services version 2.0.0 to my project, but during game testing, sign-in doesn’t work. In the canvas, I’m displaying the sign-in status text, and it always says “Canceled.” The editor version is 6, all settings in the Play Console and Google Cloud are correct. I tested with both SHA-1 keys, and nothing happens—there’s simply no response when trying to sign in. Has anyone encountered this issue?