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What it means

The Living-Security-Version header requested an unsupported API version. The value may be malformed, unknown, or no longer supported.

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What to do

  • Send a supported YYYY-MM-DD version value in the Living-Security-Version header.
  • If your pinned version has been sunset, follow the migration guide in the changelog to move to a current version.
  • Check detail — it states why the requested version was rejected.