Dcom Interface No such interface supported after migration to X64

[ThomasAndreas Kocher]

we changed our Software from X86 to X64 since there is a Problem with the dcom Interface. We get the following error

018-12-14 06:26:23.999 [002E8,0668] DEVELOPER TRACE: TComPtr<{2DF6EF8A-3EE8-11D1-BF07-008029E20A31}="">::coCreateInstance(clsid={2DF6EF8B-3EE8-11D1-BF07-008029E20A31}="NmsTaskManager.JobManager",user=tkocher) failed with rc=0x80004002 No such interface supported

we created the Interface as we did this for X86 by setting the registry keys

static void doSetDcomClientInterface( const CString& serverName, const CString& aName, const CString& cName, const CString& clsid, const CString& appid ){
  out("... doSetDcomClientInterface serverName " + serverName + " aName " + aName +  "cName " + cName + " clsid  "  + clsid  + "  appid " + appid + "   ... ");
  doDeleteKey( "HKCR\\CLSID\"+clsid );
  doDeleteKey( "HKCR\\AppID\"+appid );
  doSetKey( "HKCR\"+cName        , ""                 , cName       );
  doSetKey( "HKCR\"+cName+"\\CLSID" , ""              , clsid       );
  doSetKey( "HKCR\\AppID\"+appid , ""                 , aName       );
  doSetKey( "HKCR\\AppID\"+appid , "RemoteServerName" , serverName  );
  doSetKey( "HKCR\\CLSID\"+clsid , ""                 , cName       );
  doSetKey( "HKCR\\CLSID\"+clsid , "AppID"            , appid       );
  out("... doSetDcomClientInterface serverName " + serverName + " aName " + aName + "cName " + cName + " clsid  " + clsid + "  appid " + appid + "  done  ... ");
}

doSetKey is setting the registry Key in the windows registry

the parameters for the the NmsTaskManager.JobManager are

serverName:PC1087
aName:Nms Task Manager
cName:NmsTaskManager.JobManager
clsid:{2DF6EF8B-3EE8-11D1-BF07-008029E20A31}
appid:{2DF6EF81-3EE8-11D1-BF07-008029E20A31}

which are the same which worked on X86

must i set the dcom Interace for X64 differently?

does anybody knows why i does no more works ?