Use connection attribute of ldap access object

			return $exists;

		}

		$requiredLDAPattributes = [

			'dn',

			strtolower($this->connection->ldapExpertUsernameAttr),

			strtolower($this->connection->ldapUserDisplayName)

		];

		$backends = $this->userManager->getBackends();

		foreach ($backends as $backend) {

			if ($backend->getBackendName() === 'LDAP') {

				$access = $backend->getLDAPAccess($uid);

				$requiredLDAPattributes = [

					'dn',

					strtolower($access->connection->ldapExpertUsernameAttr),

					strtolower($access->connection->ldapUserDisplayName)

				];

				$users = $access->fetchUsersByLoginName($uid, $requiredLDAPattributes);

				if (count($users) > 0) {

					$exists = true;