VORSEN review for Google & YouTube

This app has been helpful in creating Smart Shopping Ads for us. However, we have had an error message on Google Merchant Centre displaying "Pre-emptive item disapproval (availability)" every few months, for several years. The service team continuously re-directs the issue to Google but we strongly believe the issue is the mapping of the Availability field. If this gets mapped across correctly, then our feed will reflect our data in Shopify. Has anyone else experienced the same issue?