Failed to load map. Error contacting Google servers. This is probably an authentication issue

by

it sounds like you have problem with your API_KEY which is obtained from Google API Access ,so verify your API_KEY , certificate fingerprints and package name

also use this inside <manifest> 

<uses-feature
        android:glEsVersion="0x00020000"
        android:required="true" >
    </uses-feature>

and also verify: <meta-data .... > should be inside <application> tag

PS.

1. Also try by adding following Permission

<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES"/>

2. After changing API key in AndroidManifest.xml Must Clear Application Data

To Clear Application Data :

Either Go to Settings>Application Manager>Select Your Application > Click on Clear Data

Or Must Uninstall The Application before installing it ! Note Don’t Re-install unless you Completely Uninstall the Application in order to clear its Data completely

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