Telerik Backend Services had some minor disruptions in the work of one of their push notifications servers, which caused the delay in sending some push notifications. The problem is now resolved and all notifications should be processed instantly. Please, accept our apologies if this has caused any inconvenience.
Notifications created from the UI portal of Backend Services of type "Broadcast" does not include the 'sound' property in their payload for iOS. Thus, no sound is played at the time when a notification is received.
For instance, the basic payload for iOS that will reproduce a sound should look like the following:
"Push message from my app"
More info about the supported structure of the notification payload can be found in this documentation article: Push Notifications Structure
You can create platform-specific payload for the notification from the UI. The default sound for iOS will be played when such notification is received.
I hope that this helps. Please, do not hesitate to contact us if you have questions.
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