This message is sent by Purplle when the delivery of the order fails due to the following reasons; 

a. If the OTP is not shared with the delivery partner 
b. If a customer is not reachable due to network issues 
c. If the customer is not available at the delivery location or if a customer has refused to accept the delivery. Delivery attempts are made once in the day. 

If a delivery fails, Purplle will intimate customers through SMS and Whatsapp messages with a link to update the re-attempt request. You can also update the re-attempt request on the app by going to the my order section and click view order. A re-attempt will mostly happen the next working day.