Issue #3280061 by dtfabio: Change field name to correct ActiveCampaing field names

src/Plugin/CustomerDataStorage/ActiveCampaign.php

@@ -85,8 +85,8 @@ class ActiveCampaign extends CustomerDataStoragePluginBase implements ContainerF
     return [
       'email' => $this->t('E-mail'),
       'phone' => $this->t('Phone'),
-      'firstName' => $this->t('First name'),
-      'lastName' => $this->t('Last name'),
+      'first_name' => $this->t('First name'),
+      'last_name' => $this->t('Last name'),
     ];
   }