diff --git a/apps/user_ldap/lib/Access.php b/apps/user_ldap/lib/Access.php
index ea13b62d119..e55d6a6591c 100644
--- a/apps/user_ldap/lib/Access.php
+++ b/apps/user_ldap/lib/Access.php
@@ -740,6 +740,7 @@ class Access extends LDAPUtility {
 	 */
 	public function cacheUserExists(string $ocName): void {
 		$this->connection->writeToCache('userExists' . $ocName, true);
+		$this->connection->writeToCache('userExistsOnLDAP' . $ocName, true);
 	}
 
 	/**
diff --git a/apps/user_ldap/lib/User/Manager.php b/apps/user_ldap/lib/User/Manager.php
index 3695b4efd74..ead8e96f15c 100644
--- a/apps/user_ldap/lib/User/Manager.php
+++ b/apps/user_ldap/lib/User/Manager.php
@@ -265,9 +265,7 @@ class Manager {
 		if ($this->isDeletedUser($id)) {
 			return true;
 		}
-		$this->logger->debug('username2dn({id})', ['id' => $id]);
 		$dn = $this->access->username2dn($id);
-		$this->logger->debug('end username2dn({id})', ['id' => $id]);
 		if ($dn !== false) {
 			return true;
 		}
diff --git a/apps/user_ldap/lib/User_LDAP.php b/apps/user_ldap/lib/User_LDAP.php
index 261bfa69b4c..e55dca03d25 100644
--- a/apps/user_ldap/lib/User_LDAP.php
+++ b/apps/user_ldap/lib/User_LDAP.php
@@ -612,7 +612,6 @@ class User_LDAP extends BackendUtility implements IUserBackend, UserInterface, I
 							$uuid,
 							true
 						);
-						$this->access->cacheUserExists($username);
 					} else {
 						$this->logger->warning(
 							'Failed to map created LDAP user with userid {userid}, because UUID could not be determined',