Usually, just installing GAM isn't enough. You often need a second "FRP Bypass APK" that triggers a "Browser Sign-in" window, allowing you to log in with any active Gmail account.
You should only search for “download Google Account Manager 7.1.1” if you fall into one of these three categories: download google account manager 7.1.1
You are a casual user, you are trying to fix a modern phone (Android 10+), or you found the APK on a popup ad that says "Download Google Account Manager 7.1.1 Free." Usually, just installing GAM isn't enough