SAML metadata import by REST API

Getting advice
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1

Hi all,
On KC 23.0.3, I have the requirement to import an IDP metadata XML file through REST calls, but am unable to make the client-description-converter API to work.
Trying the conversion XML → JSON, the result in console is: " Cannot invoke “org.keycloak.dom.saml.v2.metadata.SPSSODescriptorType.isWantAssertionsSigned()” because “spDescriptorType” is null"

But the same metadata file can be imported with no trouble in the KC admin console.
Any idea of what is missing?

2

To give more details, client-description-converter accepts a modified metadata file with a dummy added line:
<md:SPSSODescriptor WantAssertionsSigned=“true” protocolSupportEnumeration=“urn:oasis:names:tc:SAML:2.0:protocol”/>
but <md:IDPSSODescriptor… part is not parsed.

What am I missing?