invalid_api_version

The Tickwire-Version header, or the apiVersion to pin, names no published API version.

HTTP 400. Nothing reached the broker.

Likely causes:

• The value is not a date in YYYY-MM-DD form.
• The date is not one of the published versions (the message and metadata.supportedVersions list them).

What to do: Send a published version from the versioning page, or omit the header to use your organisation’s pinned version. Nothing was sent or changed.

Retry: No. The same request gets the same answer; change something first.

Listed under Requests and validation in Errors. Send the error’s requestId to support and we can find the request.