# Debugging push notification failures for Amazon Chime SDK messaging
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The Amazon Chime SDK integrates with Amazon EventBridge in order to notify you of push message delivery failures. To further debug failures, you can also look into the [CloudWatch metrics](https://docs.aws.amazon.com/pinpoint/latest/userguide/monitoring-metrics.html) that Amazon Pinpoint sends for failures.

The following table lists and describes the delivery error messages.


| Message | Description | 
| --- | --- | 
| The request processing has failed because of an unknown error, exception or failure. | We encountered an internal error. Please try again. | 
| The specified resource was not found. AppInstanceUserEndpoint will be deactivated. | The Amazon Pinpoint application does not exist. | 
| Too many requests sent to Amazon Pinpoint. | Amazon Pinpoint has throttled your outgoing messages. | 
| Unable to send messages. Please verify IAM Permissions Policy on ServiceRoleForAmazonChimePushNotification. | The role created for the Amazon Chime SDK does not have permission to call `mobiletargeting:SendMessages`. Please verify the IAM policy on the role. | 
| Unable to send messages. Please verify IAM Trust Relationships on ServiceRoleForAmazonChimePushNotification. | The Amazon Chime SDK does not have permission to access the role for push notificiations.  Please verify the IAM role's trust policy contains the service principal, `messaging.chime.amazonaws.com`. |