Your main image is below Walmart's required 1000x1000 pixel minimum. The item ingests but cannot trigger zoom and is flagged for low listing quality.
Walmart requires main images to be at least 1000 pixels on the longest side, with 2000 pixels recommended for zoom enablement. Smaller images blur on product pages and harm conversion. Walmart's image processor rejects anything under 500x500 outright and warns on anything between 500 and 999.