diff --git a/app/plugins/Transmogrify/config/schema/tables.json b/app/plugins/Transmogrify/config/schema/tables.json
index 294f4ffe..d4103fba 100644
--- a/app/plugins/Transmogrify/config/schema/tables.json
+++ b/app/plugins/Transmogrify/config/schema/tables.json
@@ -574,5 +574,22 @@
             "co_enrollment_flow_id": null,
             "co_pipeline_id": "pipeline_id"
         }
+    },
+    "external_identity_sources": {
+        "source": "cm_org_identity_sources",
+        "displayField": "description",
+        "booleans": ["hash_source_record"],
+        "cache": ["co_id"],
+        "fieldMap": {
+            "plugin": "&mapExternalIdentitySourcePlugin",
+            "co_pipeline_id": "pipeline_id",
+            "sync_mode": null,
+            "sync_query_mismatch_mode": null,
+            "sync_query_skip_known": null,
+            "sync_on_user_login": null,
+            "eppn_identifier_type": null,
+            "eppn_suffix": null,
+            "org_identity_source_id": "external_identity_source_id"
+        }
     }
 }
diff --git a/app/plugins/Transmogrify/src/Command/TransmogrifyCommand.php b/app/plugins/Transmogrify/src/Command/TransmogrifyCommand.php
index 35e9965d..acc1cfc4 100644
--- a/app/plugins/Transmogrify/src/Command/TransmogrifyCommand.php
+++ b/app/plugins/Transmogrify/src/Command/TransmogrifyCommand.php
@@ -451,6 +451,9 @@ public function execute(Arguments $args, ConsoleIo $io): int
         }
         catch(\Exception $e) {
           $this->cache['error'] += 1;
+          if (isset($row['id'])) {
+            $this->cache['rejected'][$outboundQualifiedTableName][$row['id']] = $row;
+          }
           $rowIdLabel = $row['id'] ?? ($this->tables[$t]['displayField'] ?? 'n/a');
           $this->cmdPrinter->error("$t record " . (string)$rowIdLabel . ": " . $e->getMessage());
           $this->cmdPrinter->pause();
diff --git a/app/plugins/Transmogrify/src/Lib/Traits/TypeMapperTrait.php b/app/plugins/Transmogrify/src/Lib/Traits/TypeMapperTrait.php
index a65a7ded..47b15b49 100644
--- a/app/plugins/Transmogrify/src/Lib/Traits/TypeMapperTrait.php
+++ b/app/plugins/Transmogrify/src/Lib/Traits/TypeMapperTrait.php
@@ -30,6 +30,7 @@
 namespace Transmogrify\Lib\Traits;
 
 use App\Lib\Enum\PetitionStatusEnum;
+use Cake\ORM\TableRegistry;
 use Doctrine\DBAL\Exception;
 use Doctrine\DBAL\Exception\UniqueConstraintViolationException;
 use Transmogrify\Lib\Util\RawSqlQueries;
@@ -38,7 +39,7 @@
 /**
  * Encapsulates all type mapping logic and helpers (map_type + specific wrappers).
  *
- * @since  COmanage Registry v5.0.0
+ * @since  COmanage Registry v5.2.0
  */
 trait TypeMapperTrait
 {
@@ -143,6 +144,68 @@ protected function mapAffiliationType(array $row, ?int $coId = null): ?int
   }
 
   /**
+   * Map v4 External Identity Source plugin name to v5 plugin model path.
+   *
+   * Generic logic:
+   * - If a plugin exists with the same name as the v4 Source (ends with "Source"),
+   *   return "Plugin.PluralTable" (eg: EnvSource -> EnvSource.EnvSources).
+   * - Else, if a "<Base>Connector" plugin exists for a "BaseSource", return
+   *   "BaseConnector.PluralTable" (eg: FileSource -> FileConnector.FileSources).
+   *
+   * @param array $row A row from cm_org_identity_sources containing 'plugin'
+   * @return string|null The v5 Plugin.Table string or null if unmapped/empty
+   * @since COmanage Registry v5.2.0
+   */
+  protected function mapExternalIdentitySourcePlugin(array $row): ?string
+  {
+    $v4 = $row['plugin'] ?? null;
+    if (!$v4) {
+      return null;
+    }
+
+    $pluginsTable = TableRegistry::getTableLocator()->get('Plugins');
+
+    $pluginRows = $pluginsTable
+      ->find()
+      ->select(['plugin'])
+      ->where(fn($exp) => $exp->isNotNull('plugin'))
+      ->distinct()
+      ->disableHydration()
+      ->all();
+
+    $available = array_map(static fn(array $r) => (string)$r['plugin'], $pluginRows->toList());
+
+    // Only process names that end with "Source"
+    if (!str_ends_with($v4, 'Source')) {
+      return null;
+    }
+
+    // Pluralized Table name for the model side (eg, EnvSource -> EnvSources)
+    $pluralTable = Inflector::pluralize($v4);
+
+    // 1) Direct plugin exists with same name as the Source
+    //    Example: EnvSource -> EnvSource.EnvSources
+    if (in_array($v4, $available, true)) {
+      return $v4 . '.' . $pluralTable;
+    }
+
+    // 2) If it's a "Source", check for "<Base>Connector"
+    //    Example: FileSource -> FileConnector.FileSources
+    $base = substr($v4, 0, -strlen('Source'));
+    $connector = $base . 'Connector';
+
+    if (in_array($connector, $available, true)) {
+      return $connector . '.' . $pluralTable;
+    }
+
+    // No mapping found
+//    return null;
+    throw new \InvalidArgumentException("Unable to map External Identity Source plugin: $v4. Plugin not implemented in COmanage Registry v5.");
+  }
+
+
+
+    /**
    * Map email type to corresponding type ID
    *
    * @param array $row Row data containing email type