In Azure i have created a sample notification hub and tried to send test Toast notification for windows. And i ended up with below exception in Azure.
Failed to send test message. Error: {"readyState":4,"responseText":"{\"error\":{\"message\":\"Bad Request\",\"code\":\"BadRequest\"}}","responseJSON":{"error":{"message":"Bad Request","code":"BadRequest"}},"status":400,"statusText":"Bad Request"}.
[Find the screenshot for reference] https://i.stack.imgur.com/6tbFm.png