JVMTI gets local variable access capability on connect

I am writing a custom agent for java using JVMTI libraries and am trying to get access to local variables. when loading the agent in the OnLoad phase, the activation option can be enabled, but when loading in real time (OnAttach) it seems impossible and when I try to add it I get the error - JVMTI_ERROR_ABSENT_INFORMATION.

This is my OnAttach function (C language)

JNIEXPORT
jint
JNICALL
Agent_OnAttach(
    JavaVM *jvm,
    char *options,
    void *reserved
    )
{
    jvmtiEnv *jvmti;
    jvmtiCapabilities PotentialCap, RequestedCap;
    jvmtiError error;

    memset(&RequestedCap, 0, sizeof(RequestedCap));

    jvm->GetEnv((PVOID*)&jvmti, JVMTI_VERSION_1_0);
    jvmti->GetPotentialCapabilities(&PotentialCap);

    RequestedCap.can_access_local_variables = 1;

    error = jvmti->AddCapabilities(&RequestedCap);

    if (error != JVMTI_ERROR_NONE)
    {
        MessageBox(
            NULL,
            L"Fail to request local variable access",
            L"Native Agent",
            NULL);
    }

    return JNI_OK;
}

      

        
        
        
      

    

Is there a way to enable real-time access to a local variable?

thank