diff --git a/go.mod b/go.mod
index 6710d33bb..e2f41ef7f 100644
--- a/go.mod
+++ b/go.mod
@@ -209,3 +209,4 @@ require (
 )
 
 replace github.com/robfig/cron/v3 => github.com/unionai/cron/v3 v3.0.2-0.20210825070134-bfc34418fe84
+replace github.com/flyteorg/flyteidl => ../flyteidl
\ No newline at end of file
diff --git a/pkg/manager/impl/execution_manager.go b/pkg/manager/impl/execution_manager.go
index 4f4689715..5a74436e8 100644
--- a/pkg/manager/impl/execution_manager.go
+++ b/pkg/manager/impl/execution_manager.go
@@ -403,11 +403,33 @@ func (m *ExecutionManager) getExecutionConfig(ctx context.Context, request *admi
 			RunAs: &core.Identity{},
 		}
 	}
+
+	if workflowExecConfig.GetSecurityContext().GetRunAs() == nil {
+		workflowExecConfig.SecurityContext.RunAs = &core.Identity{}
+	}
+
+	// In the case of reference_launch_plan subworkflow, the context comes from flytepropeller instead of the user side, so user auth is missing.
+	// We skip getUserIdentityFromContext but can still get ExecUserId because flytepropeller passes it in the execution request.
+	// https://github.com/flyteorg/flytepropeller/blob/03a6672960ed04e7687ba4f790fee9a02a4057fb/pkg/controller/nodes/subworkflow/launchplan/admin.go#L114
+	if workflowExecConfig.GetSecurityContext().GetRunAs().GetUserIdentifier() == "" {
+		workflowExecConfig.SecurityContext.RunAs.UserIdentifier, err = getUserIdentityFromContext(ctx)
+
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	logger.Infof(ctx, "getting the workflow execution config from application configuration")
 	// Defaults to one from the application config
 	return &workflowExecConfig, nil
 }
 
+func getUserIdentityFromContext(ctx context.Context) (string, error) {
+	idCtx := auth.IdentityContextFromContext(ctx)
+
+	return idCtx.UserID(), nil
+}
+
 func (m *ExecutionManager) getClusterAssignment(ctx context.Context, request *admin.ExecutionCreateRequest) (
 	*admin.ClusterAssignment, error) {
 	if request.Spec.ClusterAssignment != nil {
@@ -676,7 +698,8 @@ func resolveSecurityCtx(ctx context.Context, executionConfigSecurityCtx *core.Se
 	// Use security context from the executionConfigSecurityCtx if its set and non empty or else resolve from authRole
 	if executionConfigSecurityCtx != nil && executionConfigSecurityCtx.RunAs != nil &&
 		(len(executionConfigSecurityCtx.RunAs.K8SServiceAccount) > 0 ||
-			len(executionConfigSecurityCtx.RunAs.IamRole) > 0) {
+			len(executionConfigSecurityCtx.RunAs.IamRole) > 0 ||
+			len(executionConfigSecurityCtx.RunAs.UserIdentifier) > 0) {
 		return executionConfigSecurityCtx
 	}
 	logger.Warn(ctx, "Setting security context from auth Role")
diff --git a/pkg/manager/impl/execution_manager_test.go b/pkg/manager/impl/execution_manager_test.go
index e8d16d348..e6fc76e7e 100644
--- a/pkg/manager/impl/execution_manager_test.go
+++ b/pkg/manager/impl/execution_manager_test.go
@@ -23,6 +23,7 @@ import (
 	"github.com/flyteorg/flyteadmin/pkg/runtime"
 	"github.com/flyteorg/flyteidl/clients/go/coreutils"
 	"github.com/flyteorg/flyteidl/gen/pb-go/flyteidl/event"
+	"github.com/flyteorg/flyteidl/gen/pb-go/flyteidl/service"
 	"github.com/gogo/protobuf/jsonpb"
 	"github.com/golang/protobuf/ptypes"
 	"github.com/stretchr/testify/mock"
@@ -5330,3 +5331,13 @@ func TestAddStateFilter(t *testing.T) {
 	})
 
 }
+
+func TestGetUserIdentityFromContext(t *testing.T) {
+
+	idCtx, err := auth.NewIdentityContext("", "byhsu", "", time.Now(), sets.String{}, &service.UserInfoResponse{}, map[string]interface{}{})
+	assert.NoError(t, err)
+	ctx := context.WithValue(context.Background(), auth.ContextKeyIdentityContext, idCtx)
+	uid, err := getUserIdentityFromContext(ctx)
+	assert.NoError(t, err)
+	assert.Equal(t, "byhsu", uid)
+}
diff --git a/pkg/manager/impl/util/shared.go b/pkg/manager/impl/util/shared.go
index bf9490473..337c639f4 100644
--- a/pkg/manager/impl/util/shared.go
+++ b/pkg/manager/impl/util/shared.go
@@ -297,7 +297,8 @@ func MergeIntoExecConfig(workflowExecConfig admin.WorkflowExecutionConfig, spec
 	if workflowExecConfig.GetSecurityContext() == nil && spec.GetSecurityContext() != nil {
 		if spec.GetSecurityContext().GetRunAs() != nil &&
 			(len(spec.GetSecurityContext().GetRunAs().GetK8SServiceAccount()) > 0 ||
-				len(spec.GetSecurityContext().GetRunAs().GetIamRole()) > 0) {
+				len(spec.GetSecurityContext().GetRunAs().GetIamRole()) > 0 ||
+				len(spec.GetSecurityContext().GetRunAs().GetUserIdentifier()) > 0) {
 			workflowExecConfig.SecurityContext = spec.GetSecurityContext()
 		}
 	}