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salesforce push notification to salesforce for android

I need to send a push notification to salesforce built in mobile app salesforce for android, I have the app as a connected app to my org.

I have apex code which sends notification when case is created

msg.send('Salesforce for Android',users);

I get error as "NoAccessExpection: common.apex.runtime.impl.ExecutionException: Invalid connected application: Salesforce for Android"