Some Amazon orders cannot be delete, edited or processed and show with the Address of unknown.
If in Open orders and not selected on a fulfilment centre then these orders are Amazon pending orders.
A pending order from Amazon is an order which has been placed however has not yet been paid for or has not had payment confirmed. If these orders are cancelled or not confirmed then they will be deleted from the system, otherwise the address details will be provided and the orders will be unparked.
These orders should not be deleted or unparked as the stock is accounted for and therefore if deleted this may cause an oversell.
How To Delete if you are 100% certain the order is not required
1. Select the order
2. Right Click > Actions > Bulk Change > Unpark Order
3. It will now be possible to delecte the order