CHW-4516 CoverageFlagInvalid
coverage flag payload requires a non-empty client_id; check the request body shape
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Default message: coverage flag payload requires a non-empty client_id; check the request body shape
HTTP status:400(client)
Problem. A coverage-flag write returned 400. Cause. The body
could not be decoded, or its client_id was empty. Fix. Resend
with a non-empty client_id matching a known credential. HTTP 400.