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Push Notifications can fail for various reasons- the token might have expired or the push message may have been too large for the Push service to process, and so on. Here are the most frequently occurring errors and their reasons.
Error or Alternative ErrorDescription
Unregistered Also known as:
- Gone
- Not Found		An existing registration token may cease to be valid in several scenarios, including:
- If the registration token expires
- If the client app is updated but the new version is not configured to receive messages.
- The device is inactive.
Sender temporarily Also known as:
- unavailable
- Internal Error
- Internal Server Error from FCM Service
- Temporary Error from FCM Service
- The request timed out - Unknown server error		Either the Sender server experienced an internal error while trying to process the request, or it is temporarily unavailable.
Authorization Error Also known as:
- Bad Authorization
- Forbidden		The Authentication Key for APNS or Web Push is invalid/expired. Please check your push Authorization setup.
Invalid Vapid DetailsVapid keys generated for Web push are wrong/invalid. Please check Web SDK integration or contact your MoEngage Customer Success Manager (CSM) or the Support team.