The tax code you submitted is not a valid Walmart Tax Code (WTC). Items without valid tax codes cannot publish because Walmart cannot collect sales tax.
Walmart uses its own tax taxonomy (WTCs), not Avalara or generic codes. Each item must reference a WTC that maps to the correct sales tax category for every state. Common failures: using Avalara codes by mistake, leaving the field blank, or using a deprecated WTC from an older spec version.