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General

AWS request is missing the action parameter

MissingAction

AWS rejected the query-style request because the required action or operation name was not supplied.

MissingActiongeneral

Observed message

MissingAction

Why it happens

  • The request omitted the required action parameter.
  • Custom client code built the request incorrectly.
  • An integration or proxy stripped required query parameters.

How to fix it

  1. Check that the request includes the correct action name for the API call.
  2. Validate any custom request-building logic or middleware.
  3. Retry after restoring the missing action parameter.

Official reference

AWS Support API Reference: Common Errors

Related errors

OptInRequiredAWS account is not subscribed to the serviceInvalidActionAWS API request used an invalid actionRequestExpiredAWS request expired because the timestamp was too oldServiceUnavailableAWS request failed because the service was unavailable

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AWS MissingAction: causes and fixes | Error Atlas