If you run into the Walmart error:
Warning: Code: PIVI_032, Details: Lag time exception approval required for category (category).
This is in direct relation to your leadtime to ship. Walmart does require a leadtime of 0-1 days, which is Listing Mirror's default. If you set your leadtime to anything greater than the required 0-1 days, you may see this error.
The easiest solution for this would be to change your MF lead time back to an acceptable 0-1 timeframe in your integration settings:
However you can choose to reach out to Walmart directly and request a Lag Time Exception.
If you have any questions please reach out to support!