XML namespace incorrect so mapping fails

Summary

Incoming xml payload to REST endpoint has a namespace mismatch so mapping fails

Content

I have a REST endpoint configured with an xsd that declares a target namespace. A payload submitted from postman is processed successfully by ICS - all mappings produce values.

When integrating with OMC the mappings fail to produce any values so the next step fails. When looking at the payload via ICS - activity stream it has no namespace which is why the mapping fails. I'm not sure if ICS strips the incoming namespace, or if OMC is sending a payload that doesn't align with their xsd but regardless... I need to somehow process the payload.