Emojis are unsupported on certain devices such as those on Windows 7/8. Emojis can really help engage your customers, but not all devices can receive web push notifications with emojis. Be sure to visit caniemoji.com to learn more.
With Push Nova, we only allow Emoji's at the end of title and message body text. This is required because we remove emojis for customers on devices that don't support them in notifications.