Sending of silent notification fails in internal error


when using the UI portal to send silent push notifications in a developer project we get the error shown below.
Any ideas what the reson could be?



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  • In order to send a silent notification to Android devices you will need to include a Custom Key under the Optional Delivery Features.

    You can include any key:value pair, but you'll want to make sure to not use one which would cause other actions within your application.

    This is due to a restriction of the Android platform, which only allows for non-alerting notifications to be delivered if they contain some type of "data"

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