Thank you for your reply. We have figured out the cause of the problem, which is incorrect inventory location ID.

Hello, When using API call to adjust inventory, the call received 404 error back.API：inventory_levels/adjust.jsonPath : https://c2f650ca0a99f8ce68a3a247c4f815fc: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@developermk.myshopify.com/admin/api/2021-04/invent...