Hello Quillaur,
Please see: Azure
Notification Hubs Notify Users with .NET backend
You could try sending it to specific devices (users) as described in the above tutorial. Ultimately it depends on how you send it from the back-end service (web api).
I am not sure familier with azure sdk but can you please take a look at this?
How To: Send Scheduled Notifications
With Regards,
Krunal Parekh
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