We have the same issue, let’s try your solution and see if it’s better. We have missed some customer for that.
Topic summary
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Issue: Customers encounter “No delivery available for 0 items” at checkout and can’t proceed to shipping. Reports began after a recent update and affect multiple stores.
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Support response: Shopify staff advised contacting authenticated support with abandoned cart details and screenshots. Some merchants said the support link looped and couldn’t reach chat/phone.
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Observations: One merchant saw customer default addresses filling billing but not shipping fields. Merchants reported no recent settings changes.
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Workarounds/resolution: The original poster fixed it by deleting shipping profiles and rebuilding them under General shipping with correct zones. In a second store, adding missing products to the appropriate shipping profile resolved checkout.
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Impact: Multiple lost sales reported while the issue persisted. Other merchants plan to try the shipping-profile reset and asked for confirmation of results.
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Status: No official root cause or platform fix identified in the thread. Community workaround (recreating shipping profiles and ensuring all products are assigned) appears effective for at least one merchant; the discussion remains open for others.