# Troubleshooting Amazon errors

| Error                   | Description                                                                 | What to do |
|-------------------------|---------------------------------------------------------------------|------------|
| **ADMFailed**           | An internal ADM failure caused notification delivery to fail.      | Try sending the message again later. |
| **ADMUnavailable**      | The ADM server is currently unavailable.                           | Try sending the message again later. |
| **BadRequest**          | Failed to complete the request to Amazon.                         | Try sending the message again later. |
| **FailedToGetADMToken** | ADM authentication failed.                                        | Try sending the message again later. |
| **FrequencyCapping**    | The device was filtered by [Frequency Capping](/product/messaging-channels/global-frequency-capping). | If such behavior was not intended, check the [Frequency Capping](/product/messaging-channels/global-frequency-capping) settings. |
| **InvalidRegistrationId** | The push token is invalid; the device will be unsubscribed from notifications. | Use a valid token. |
| **Unregistered**        | The push token is invalid; the device will be unsubscribed from notifications. | Try using a new token. |