Walmart is strictly enforcing against the use of FBA to fulfill Walmart Orders. If you currently use FBA to fulfill all orders we recommend you use one of many 3PL's that integrates with Zentail.
Please see this FAQ for a list of 3PL's that Zentail Integrates with: FAQ
To prevent Walmart orders from being routed to FBA please follow the steps below:
Go to your Account Settings page
Click on your "FBA" warehouse
Scroll down to "Warehouse Channel Overrides"
Toggle the Walmart Option to Disable