diff --git a/src/azure-cli/azure/cli/command_modules/resource/_utils.py b/src/azure-cli/azure/cli/command_modules/resource/_utils.py
index 9d875bf8992..bb73bca6ce4 100644
--- a/src/azure-cli/azure/cli/command_modules/resource/_utils.py
+++ b/src/azure-cli/azure/cli/command_modules/resource/_utils.py
@@ -76,3 +76,34 @@ def split_resource_id(resource_id):
         return subscription_scope, relative_resource_id
 
     return "/", relative_resource_id
+
+
+def _build_preflight_error_message(preflight_error):
+    err_messages = [f'{preflight_error.code} - {preflight_error.message}']
+    for detail in preflight_error.details or []:
+        err_messages.append(_build_preflight_error_message(detail))
+    return '\n'.join(err_messages)
+
+
+def _build_http_response_error_message(http_error):
+    error_txt = http_error.response.internal_response.text
+
+    import json
+    error_info = json.loads(error_txt)['error']
+    error_details = error_info.pop('details') if 'details' in error_info else []
+    err_messages = [f'{error_info}']
+
+    for detail in error_details:
+        err_messages.append(_build_error_details(detail))
+
+    return '\n\n'.join(err_messages)
+
+
+def _build_error_details(error_detail):
+    nested_error_details = error_detail.pop('details') if 'details' in error_detail else []
+    err_messages = [f'Inner Errors: \n{error_detail}']
+
+    for detail in nested_error_details:
+        err_messages.append(_build_error_details(detail))
+
+    return '\n\n'.join(err_messages)
diff --git a/src/azure-cli/azure/cli/command_modules/resource/custom.py b/src/azure-cli/azure/cli/command_modules/resource/custom.py
index 7883c30d06a..ecca48388d0 100644
--- a/src/azure-cli/azure/cli/command_modules/resource/custom.py
+++ b/src/azure-cli/azure/cli/command_modules/resource/custom.py
@@ -58,6 +58,8 @@
     supports_bicep_publish
 )
 
+from ._utils import _build_preflight_error_message, _build_http_response_error_message
+
 logger = get_logger(__name__)
 
 RPAAS_APIS = {'microsoft.datadog': '/subscriptions/{subscriptionId}/providers/Microsoft.Datadog/agreements/default?api-version=2020-02-01-preview',
@@ -369,8 +371,9 @@ def _deploy_arm_template_core_unmodified(cmd, resource_group_name, template_file
     if cmd.supported_api_version(min_api='2019-10-01', resource_type=ResourceType.MGMT_RESOURCE_RESOURCES):
         try:
             validation_poller = deployment_client.begin_validate(resource_group_name, deployment_name, deployment)
-        except HttpResponseError as cx:
-            raise_subdivision_deployment_error(cx.response.internal_response.text, cx.error.code if cx.error else None)
+        except HttpResponseError as err:
+            err_message = _build_http_response_error_message(err)
+            raise_subdivision_deployment_error(err_message, err.error.code if err.error else None)
         validation_result = LongRunningOperation(cmd.cli_ctx)(validation_poller)
     else:
         validation_result = deployment_client.validate(resource_group_name, deployment_name, deployment)
@@ -489,8 +492,9 @@ def _deploy_arm_template_at_subscription_scope(cmd,
     if cmd.supported_api_version(min_api='2019-10-01', resource_type=ResourceType.MGMT_RESOURCE_RESOURCES):
         try:
             validation_poller = mgmt_client.begin_validate_at_subscription_scope(deployment_name, deployment)
-        except HttpResponseError as cx:
-            raise_subdivision_deployment_error(cx.response.internal_response.text, cx.error.code if cx.error else None)
+        except HttpResponseError as err:
+            err_message = _build_http_response_error_message(err)
+            raise_subdivision_deployment_error(err_message, err.error.code if err.error else None)
         validation_result = LongRunningOperation(cmd.cli_ctx)(validation_poller)
     else:
         validation_result = mgmt_client.validate_at_subscription_scope(deployment_name, deployment)
@@ -579,8 +583,9 @@ def _deploy_arm_template_at_resource_group(cmd,
     if cmd.supported_api_version(min_api='2019-10-01', resource_type=ResourceType.MGMT_RESOURCE_RESOURCES):
         try:
             validation_poller = mgmt_client.begin_validate(resource_group_name, deployment_name, deployment)
-        except HttpResponseError as cx:
-            raise_subdivision_deployment_error(cx.response.internal_response.text, cx.error.code if cx.error else None)
+        except HttpResponseError as err:
+            err_message = _build_http_response_error_message(err)
+            raise_subdivision_deployment_error(err_message, err.error.code if err.error else None)
         validation_result = LongRunningOperation(cmd.cli_ctx)(validation_poller)
     else:
         validation_result = mgmt_client.validate(resource_group_name, deployment_name, deployment)
@@ -667,8 +672,9 @@ def _deploy_arm_template_at_management_group(cmd,
         try:
             validation_poller = mgmt_client.begin_validate_at_management_group_scope(management_group_id,
                                                                                      deployment_name, deployment)
-        except HttpResponseError as cx:
-            raise_subdivision_deployment_error(cx.response.internal_response.text, cx.error.code if cx.error else None)
+        except HttpResponseError as err:
+            err_message = _build_http_response_error_message(err)
+            raise_subdivision_deployment_error(err_message, err.error.code if err.error else None)
         validation_result = LongRunningOperation(cmd.cli_ctx)(validation_poller)
     else:
         validation_result = mgmt_client.validate_at_management_group_scope(management_group_id, deployment_name,
@@ -750,8 +756,9 @@ def _deploy_arm_template_at_tenant_scope(cmd,
         try:
             validation_poller = mgmt_client.begin_validate_at_tenant_scope(deployment_name=deployment_name,
                                                                            parameters=deployment)
-        except HttpResponseError as cx:
-            raise_subdivision_deployment_error(cx.response.internal_response.text, cx.error.code if cx.error else None)
+        except HttpResponseError as err:
+            err_message = _build_http_response_error_message(err)
+            raise_subdivision_deployment_error(err_message, err.error.code if err.error else None)
         validation_result = LongRunningOperation(cmd.cli_ctx)(validation_poller)
     else:
         validation_result = mgmt_client.validate_at_tenant_scope(deployment_name=deployment_name,
@@ -929,13 +936,6 @@ def _what_if_deploy_arm_template_core(cli_ctx, what_if_poller, no_pretty_print,
     return what_if_result
 
 
-def _build_preflight_error_message(preflight_error):
-    err_messages = [f'{preflight_error.code} - {preflight_error.message}']
-    for detail in preflight_error.details or []:
-        err_messages.append(_build_preflight_error_message(detail))
-    return '\n'.join(err_messages)
-
-
 def _prepare_template_uri_with_query_string(template_uri, input_query_string):
     from urllib.parse import urlencode, parse_qs, urlsplit, urlunsplit