REST vs SOAP connectors with dynamic URL

This works with a REST connector just fine:

However with a SOAP connector it does not (fails with  _message specified in the formatter, does not exist):

Both connectors do have the correct header payload. Both have Allow Script in Url checked. Any ideas what I am doing wrong?

Thank you for reaching out to us.

At present, making the endpoint dynamic in the SOAP Connector (similar to how it works with the REST Connector) is not supported in the current version of the application.

This capability is, however, on our development roadmap and planned for inclusion in future releases. We will keep you updated once this functionality becomes available.