The Error Message
We were unable to notify Walmart that an order shipped
The error given by the marketplace is: "Order Not Found"
You can see the order details in listing mirror at https://reflector.listingmirror.com/order/details/65724548/
This error occurs when Walmart shoots us back an error when Listing Mirror attempts to notify them of an order being shipped. It is typically temporary.
Wait 5-10 minutes and manually prompt LM to notify the marketplace again. You can do this from the Order Details page. Click on the Action drop-down menu and select Notify Market.
This should go thru successfully and will give you a message confirming this! If it fails again, then please contact Listing Mirror Support and we can assist you further.