This code worked great for me, using UEditorUtilitySubsystem
void FAutomationModule::OnSpawnPluginTab()
{
// Reference to your AutomationUtilityWidget
UBlueprint* UMGBP = LoadObject<UBlueprint>(nullptr, L"/Script/Blutility.EditorUtilityWidgetBlueprint'/Automation/EUW_ConsoleCommand.EUW_ConsoleCommand'");
UEditorUtilityWidgetBlueprint* EditorWidget = Cast<UEditorUtilityWidgetBlueprint>(UMGBP);
if (EditorWidget)
{
UEditorUtilitySubsystem* EditorUtilitySubsystem = GEditor->GetEditorSubsystem<UEditorUtilitySubsystem>();
EditorUtilitySubsystem->SpawnAndRegisterTab(EditorWidget);
}
}