fetch missing person data

app/src/Model/Table/ExtIdentitySourceRecordsTable.php

@@ -73,7 +73,8 @@ public function initialize(array $config): void {
     $this->setRequiresCO(true);
 
     $this->setViewContains([
-      'ExternalIdentitySources'
+      'ExternalIdentitySources',
+      'ExternalIdentities'  => ['People' => ['PrimaryName']],
     ]);
 
     $this->setPermissions([

app/templates/ExtIdentitySourceRecords/fields-nav.inc

@@ -50,14 +50,15 @@ if(!empty($vv_obj->external_identity_id)) {
       ]
     ]
   ];
-
+
+  // primary name: $vv_obj->external_identity->person->primary_name->full_name
   $subnav = [
     'name' => 'person',
     'active' => 'external_identities',
     'subActive' => 'external_identity_roles',
-    'tabsId' => $vv_obj->person_id,
+    'tabsId' => $vv_obj->external_identity->person->id,
     'tabsController' => 'people',
-    'subTabsId' => $vv_obj->external_identity_id,
+    'subTabsId' => $vv_obj->external_identity->id,
     'subTabsController' => 'external_identities',
     'tabsSupertitle' =>  $vv_obj->external_identity->description
   ];