3521301 - Master and Shadow cannot be connected due to "invalid SNC partner name"

Master and Shadow cannot be connected. 

In master ljs_trace/scc_core trace:

2024-09-24 08:21:20,992 +0200#WARN#com.sap.scc.ha#scc-init-push-26498c1j#          #master 26498c1j: Initial push failed: Data transfer to shadow system failed. See 'Log And Trace Files' and in particular scc_core.trc for details. Associated entries were logged on or around 2024-09-24 08:21:20,992 +0200.
com.sap.scc.ha.PushRequestException: com.sap.scc.ha.HaHttpClientException: request https://shadowhost:8443/shadow failed with SHADOW_UPDATE An internal error occurred. See 'Log And Trace Files' and in particular scc_core.trc for details. Associated entries were logged on or around 2024-09-24 08:21:20,989 +0200.
    at com.sap.scc.ha.PushRequest.failed(PushRequest.java:107)
    at com.sap.scc.ha.PushRequest.execute(PushRequest.java:70)
    at com.sap.scc.ha.PushToShadow.lambda$createInitPushAction$2(PushToShadow.java:175)
    at java.lang.Thread.run(Thread.java:838)
Caused by: com.sap.scc.ha.HaHttpClientException: request https://shadowhost:8443/shadow failed with SHADOW_UPDATE An internal error occurred. See 'Log And Trace Files' and in particular scc_core.trc for details. Associated entries were logged on or around 2024-09-24 08:21:20,989 +0200.
    at com.sap.scc.ha.HaHttpClientSession.checkStatusCode(HaHttpClientSession.java:218)
    at com.sap.scc.ha.HaHttpClientSession.execute(HaHttpClientSession.java:118)
    at com.sap.scc.ha.PushRequest.execute(PushRequest.java:66)
    ... 2 common frames omitted

In shadow ljs_trace/scc_core trace:

2024-09-24 08:21:20,987 +0200#DEBUG#com.sap.scc.ui#https-jsse-nio2-8443-exec-5#          #Shadow 27c9886i: Master pushes add system mapping for virtual host:port in account XXXXXXX@XX.hana.ondemand.com

2024-09-24 08:21:20,988 +0200#ERROR#com.sap.scc.config#https-jsse-nio2-8443-exec-5#          #System mapping for virtual backend \{0\}:\{1\} rejected: \{2\}
2024-09-24 08:21:20,990 +0200#ERROR#com.sap.scc#https-jsse-nio2-8443-exec-5#          #An internal error occurred. See 'Log And Trace Files' and in particular scc_core.trc for details. Associated entries were logged on or around 2024-09-24 08:21:20,989 +0200.
com.sap.scc.servlets.ShadowUpdateException: An internal error occurred. See 'Log And Trace Files' and in particular scc_core.trc for details. Associated entries were logged on or around 2024-09-24 08:21:20,989 +0200.
    at com.sap.scc.servlets.ShadowServlet.updateSystemMapping(ShadowServlet.java:470)
    at com.sap.scc.servlets.ShadowServlet.dispatch(ShadowServlet.java:81)
    at com.sap.scc.servlets.ServletUtilities.service(ServletUtilities.java:65)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:199)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
    at com.sap.scc.ui.rt.UTF8Filter.doFilter(UTF8Filter.java:22)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:168)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:144)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:168)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:596)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130)
    at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:660)
    at com.sap.js.statistics.tomcat.valve.RequestTracingValve.callNextValve(RequestTracingValve.java:113)
    at com.sap.js.statistics.tomcat.valve.RequestTracingValve.invoke(RequestTracingValve.java:59)
    at com.sap.core.js.monitoring.tomcat.valve.RequestTracingValve.invoke(RequestTracingValve.java:27)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346)
    at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:388)
    at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
    at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:936)
    at org.apache.tomcat.util.net.Nio2Endpoint$SocketProcessor.doRun(Nio2Endpoint.java:1734)
    at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
    at org.apache.tomcat.util.net.AbstractEndpoint.processSocket(AbstractEndpoint.java:1333)
    at org.apache.tomcat.util.net.Nio2Endpoint$Nio2SocketWrapper$2.completed(Nio2Endpoint.java:645)
    at org.apache.tomcat.util.net.Nio2Endpoint$Nio2SocketWrapper$2.completed(Nio2Endpoint.java:621)
    at org.apache.tomcat.util.net.SecureNio2Channel$1.completed(SecureNio2Channel.java:1024)
    at org.apache.tomcat.util.net.SecureNio2Channel$1.completed(SecureNio2Channel.java:947)
    at sun.nio.ch.Invoker.invokeUnchecked(Invoker.java:126)
    at sun.nio.ch.Invoker$2.run(Invoker.java:218)
    at sun.nio.ch.AsynchronousChannelGroupImpl$1.run(AsynchronousChannelGroupImpl.java:112)
    at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1190)
    at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
    at java.lang.Thread.run(Thread.java:838)
Caused by: com.sap.scc.config.SccConfigurationException: invalid SNC partner name XXXXXXX
    at com.sap.scc.config.BackendSystem.checkConsistency(BackendSystem.java:433)
    at com.sap.scc.config.BackendSystem.checkConsistency(BackendSystem.java:378)
    at com.sap.scc.config.BackendSystem.parseJson(BackendSystem.java:304)
    at com.sap.scc.config.BackendsConfigData.addBackendSystemFromJson(BackendsConfigData.java:255)
    at com.sap.scc.config.MappingManager.addBackendSystemFromJson(MappingManager.java:170)
    at com.sap.scc.servlets.ShadowServlet.updateSystemMapping(ShadowServlet.java:455)
    ... 39 common frames omitted

Cloud Connector HA enviorment.

KBA , BC-MID-SCC , SAP Cloud Connector On-Demand/On-Premise Connectivity , Problem