fake client gives error using CreateToken operation for ServiceAccounts

[gdasson]

I have the below code in a test function

     // Mock Kubernetes client
	k8sClient := fake.NewClientset()

	// Mock service account
	serviceAccountName := "test-service-account"
	namespace := "test-namespace"
	roleArn := "arn:aws:iam::123456789012:role/test-role"
	tokenAudience := "sts.amazonaws.com"

	// Create a mock service account object with annotations
	mockSA := &corev1.ServiceAccount{
		TypeMeta: metav1.TypeMeta{
			Kind:       "ServiceAccount",
			APIVersion: "v1",
		},
		ObjectMeta: metav1.ObjectMeta{
			Name:      serviceAccountName,
			Namespace: namespace,
			Annotations: map[string]string{
				roleARNAnnotation:  roleArn,
				audienceAnnotation: tokenAudience,
			},
		},
	}

	ctx := context.TODO()

        // Create the mock service account
	_, err := k8sClient.CoreV1().ServiceAccounts(namespace).Create(ctx, mockSA, metav1.CreateOptions{})
	if err != nil {
		t.Fatalf("failed to create mock service account: %v", err)
	}

       // Create the token for service account
	token, err := k8sClient.CoreV1().ServiceAccounts(namespace).CreateToken(ctx, serviceAccountName, &authv1.TokenRequest{
		Spec: authv1.TokenRequestSpec{
			Audiences: []string{tokenAudience},
		},
	}, metav1.CreateOptions{})
	if err != nil {
		t.Fatalf("failed to create service account token: %v", err)
	}

When I run this code, I get the error: failed to create service account token: serviceaccounts "" not found however, I can see that the serviceaccount is created properly by fake client. Not sure why the CreateToken call is refering to a blank serviceaccount. I tried figuring out the issue, but couldn't find the exact root cause.
Anybody experienced this issue before? Any help/suggestions would be appreciated.