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Docker 'manifest unknown' errors in CI: causes and how to diagnose them

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The 'manifest unknown' error means a registry found the repository but could not locate the specific tag or reference requested, and it is not an authentication failure. Common causes include a tag that was never pushed or was misnamed, a missing platform entry in a multi-architecture manifest list, a client and registry mismatch over manifest formats, or a tag or digest deleted after it was resolved. The error appears quickly with nothing downloaded, while other tags from the same repository may still pull normally. The message combines a daemon sentence and a registry error code, which is why it looks redundant. The article recommends verifying pushed tags in the publishing job so failures surface at the source rather than in downstream pulls.

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