@Yasaswini Racherla Thanks for reaching out to Microsoft Q&A, apologize for any inconvenience caused on this.
Notification Hubs sends notifications to devices running mobile apps. It does not provide email or text message capabilities. Notification Hubs also does not provide an in-browser push notification delivery service out of the box. Customers can implement this feature using SignalR on top of the supported server-side platforms.
You can refer to FAQ section mentioned in the documentation here.
Hope this helps.
Feel free to reach back to me if you have any further questions on this.