As the error mentions SOAP, my recommendation would be to use REST. Per the What's New documentation - www.microfocus.com/.../index.htm

Replacing SOAP fortifyclient with REST fortifyclient

In an effort to further secure your Fortify Software Security Center deployment, Fortify is phasing out SOAP fortifyclient and replacing it with REST fortifyclient. In this release, SOAP fortifyclient remains the default, but REST fortifyclient is available to you.

The file names for both utilities are the same, but the files are in different directories. The SOAP fortifyclient files are in <ssc_install_dir>/Tools/fortifyclient/bin and the REST fortifyclient files are in <ssc_install_dir>/Tools/fortifyclient-new-rest/bin.

To improve security and prepare for the eventual deprecation of SOAP-based fortifyclient, Fortify strongly recommends disabling SOAP and testing the REST version of fortifyclient in your testing environment. Report any lack of parity or functionality as soon as possible.