endpoint status automatically becoming inactive

If the value of EndpointStatus for an endpoint is INACTIVE, and you send a message to that endpoint through a campaign or journey, Amazon Pinpoint doesn’t attempt to send the message. If you send a message using the SendMessages API, the value of EndpointStatus is ignored. Refer to: https://docs.aws.amazon.com/pinpoint/latest/apireference/apps-application-id-endpoints-endpoint-id.html