We are experiencing the same error. Any Resolution @Shopify_77 ?
Topic summary
Customers report checkout failures showing: “A new delivery condition in the seller proposal must be accepted in order to continue,” along with changed/missing shipping rates and occasional login/timeout issues. Evidence includes multiple screenshots; attachments support that the error appears at the shipping step.
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Scope/timing: Began around a major outage (Oct 25), persisted for some merchants, then a Shopify “internal change” temporarily fixed it. The issue returned (late Jan and early Feb), affecting many stores globally and only some orders.
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Suspected causes: Third‑party calculated shipping rates (carrier apps) failing; possible links to Shopify’s new checkout rollout and the new “backup shipping rates” feature. Some note B2B accounts or having a “company name” in the address triggers the error. Apps mentioned: Boxify, Dimensions, ShipStation; Shopify support also testing for conflicts (e.g., Timesact Pre‑Order).
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Workarounds: Create draft orders and invoice manually; use manual rates or freight options that bypass the error; ask Shopify to roll back to the old checkout.
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Shopify response: Acknowledged checkout/shipping-rate issues, said developers are working on it, and advised contacting support with screenshots. No ETA provided.
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Status: Ongoing/intermittent; no definitive, universal fix yet.