Check your device notification settings. Important: To receive Gmail notifications, turn on device notifications. Settings can vary by phone or tablet. For more info, contact your device manufacturer. On your Android phone or tablet, open the Gmail app . In the top left, tap Menu Settings General settings. Tap Manage notifications. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.