If you run into an error for your Walmart listings that says Unpublished, IMS Setup is pending, this is a Walmart internal error. What this typically means is that there was an error within Walmart that has caused the listing to need to be reingested. You can do so by clicking the Save Changes button on the listing from within Listing Mirror.
This will resend the information for this listing to Walmart, and should prompt them to reingest the listing. It can take a few of these syncs for Walmart to take the information correctly.
If you need further assistance with this issue, please contact support!