diff --git a/scripts/build_env/main.py b/scripts/build_env/main.py
index bd470711..1091cc82 100644
--- a/scripts/build_env/main.py
+++ b/scripts/build_env/main.py
@@ -1,4 +1,6 @@
 import argparse
+import os
+import pathlib
 
 from envgenehelper import *
 from envgenehelper.deployer import *
@@ -278,11 +280,56 @@ def validate_appregdefs(render_dir, env_name):
     if os.path.exists(regdef_dir):
         regdef_files = findAllYamlsInDir(regdef_dir)
         if not regdef_files:
-            logger.info(f"No RegDef YAMLs found in {regdef_dir}")
+            print(f"[INFO] No RegDef YAMLs found in {regdef_dir}")
         for file in regdef_files:
-            logger.info(f"RegDef file: {file}")
-            validate_yaml_by_scheme_or_fail(file, "schemas/regdef.schema.json")
-
+            print(f"[VALIDATING] RegDef file: {file}")
+            
+            # Detect version and use appropriate schema
+            regdef_content = openYaml(file)
+            version = str(regdef_content.get('version', '1.0'))
+
+            if version != '1.0':
+                schema_path = "schemas/regdef-v2.schema.json"
+                print(
+                    f"  Using RegDef V2 schema for {os.path.basename(file)} "
+                    f"(version: {version})"
+                )
+                # Validate authConfig references for V2
+                validate_regdef_v2_authconfig(regdef_content, file)
+            else:
+                schema_path = "schemas/regdef.schema.json"
+                print(f"  Using RegDef V1 schema for {os.path.basename(file)}")
+
+            validate_yaml_by_scheme_or_fail(file, schema_path)
+
+
+def validate_regdef_v2_authconfig(regdef_content, file_path):
+    """Validate authConfig references in V2 RegDefs"""
+    auth_configs = regdef_content.get('authConfig', {})
+
+    # Config sections that may reference authConfig
+    config_sections = [
+        'mavenConfig',
+        'dockerConfig',
+        'goConfig',
+        'rawConfig',
+        'npmConfig',
+        'helmConfig',
+        'helmAppConfig',
+    ]
+
+    for config_type in config_sections:
+        if config_type in regdef_content:
+            config = regdef_content[config_type]
+            if isinstance(config, dict) and 'authConfig' in config:
+                auth_ref = config['authConfig']
+                if auth_ref not in auth_configs:
+                    raise ValueError(
+                        f"RegDef {os.path.basename(file_path)}: "
+                        f"authConfig reference '{auth_ref}' in {config_type} "
+                        f"not found in authConfig section. "
+                        f"Available authConfigs: {list(auth_configs.keys())}"
+                    )
 
 def render_environment(env_name, cluster_name, templates_dir, all_instances_dir, output_dir, g_template_version,
                        work_dir):