"Getinterfacefromglobal" method returning error code "0x8000ffff"

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Win32

ATL

COM

COM+

VC++

I've implimented a ATL single thread apartment based project .

class ATL_NO_VTABLE CMySrv :
	public CComObjectRootEx<ccomsinglethreadmodel>,
	public CComCoClass<cmysrv,&clsid_mysrv>,
	public IMySrv

In the method, I'm creating multiple worker threads and accessing the interface pointer from one context to another with using COM Interface "IGlobalInterfaceTable"

In the main thread registered the interface

void CMySrv::save()
{
    CComQIPtr<imysrv>  pMySrv(GetUnknown());
    CComPtr<iglobalinterfacetable> l_git;
    l_git.CoCreateInstance( CLSID_StdGlobalInterfaceTable );
    l_git->RegisterInterfaceInGlobal(pMySrv, __uuidof(IMySrv), &dwCookie );

    for(int i=0;i<9;i++)
        _beginthreadex( 0,0,&(CParllelThreadOperations::ThreadFunc),LPVOID(&dwCookie), 0, &dwThId);

    ////logic implemented to wait for all the child threads
}

In the worker thread I'm passing the cookie information and would get the interface

CComPtr<iglobalinterfacetable> git;
CComPtr<imysrv>  pMySrv;
HRESULT hr= 0;
if(git.CoCreateInstance( CLSID_StdGlobalInterfaceTable)>=0)
hr= git->GetInterfaceFromGlobal( dwCookie, __uuidof(IMySrv), (void**)&pMySrv);

But "GetInterfaceFromGlobal" returning "0x8000ffff" error code(it is happening rarely )
Could you please help me on this.

What I have tried:

I don't have much knowledge on GIT interface and read the other articles The Mechanics of COM+ | Mechanics | InformIT[^]