Make sure you have enabled notifications for the app. You can trigger the browser's notification permission prompt by toggling the notifications switch within the app. if it doesn't work, try the following:
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If you are using Chrome, click on the lock icon in the address bar and select permissions. Then enable notifications.
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If you are using Firefox, click on the lock icon in the address bar and then enable notifications.
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If you are using Opera, click on the shield icon in the address bar and select permissions. Then enable notifications.
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If you are using Opera mini, have some shame and switch to a real browser.
Currently, the app only supports background notifications. Make sure you don't have the app open in a tab in your browser.