Hi @Roman Pena Thanks for reaching out. Yes, the APIM Self-hosted Gateway does support SOAP APIs. As you mentioned that it works fine with default gateway Could you please verify if the API is configured to access via self-hosted gateway under settings tab
please share me the inspector trace if the call still fails to investigate further.
https://learn.microsoft.com/en-us/azure/api-management/api-management-howto-api-inspector#enable-tracing-using-ocp-apim-trace-header