Have you arrived at the customers adress, but the customer does not open the door/you cannot find the address. Then you need to do this:
1. Call the customer via the app (call 2-3 times)
2. Chat with the customer via the app
3. Contact Live Support if there is no contact with the customer
Under no circumstances may you deliver an order without direct contact with the customer, unless the customer has noted this in the order description. You may also not throw the order away or take it with you. You should always contact Live Support, they will help you step by step.