If you have not already, then create a ticket on https://support.stackcanyon.com
And provide your website URL, Admin Dashboard email and password.
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By "not working" I hope you mean nothing is working for you.
We get many tickets where people donot understand how push notification works and they think the push notification is not working.
Kindly refer to this documentation to understand how everything related to push notification works:
https://docs.foodomaa.com/faqs/push-notifications-and-alerts