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Sorry to hear you’re facing problems 
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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 23.0.0
Operating system and version (eg, Ubuntu 20.04): Debian 11
Apache or nginx version (eg, Apache 2.4.25): 2.4.52
PHP version (eg, 7.4): 7.4
The issue you are facing: I configured LDAP authorization and it works, users can access by their AD account, but I can’t configure external storage like SMB or SFTP. I use the correct credentials but it not works
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
The output of your Nextcloud log in Admin > Logging:
context Icewind\SMB\Exception\AuthenticationException: Invalid login
/var/www/html/apps/files_external/3rdparty/icewind/smb/src/Wrapped/Connection.php - line 54:
Icewind\SMB\Wrapped\Parser->checkConnectionError()
/var/www/html/apps/files_external/3rdparty/icewind/smb/src/Wrapped/Share.php - line 114:
Icewind\SMB\Wrapped\Connection->clearTillPrompt()
/var/www/html/apps/files_external/3rdparty/icewind/smb/src/Wrapped/Share.php - line 128:
Icewind\SMB\Wrapped\Share->getConnection()
/var/www/html/apps/files_external/3rdparty/icewind/smb/src/Wrapped/Share.php - line 449:
Icewind\SMB\Wrapped\Share->connect()
/var/www/html/apps/files_external/3rdparty/icewind/smb/src/Wrapped/Share.php - line 207:
Icewind\SMB\Wrapped\Share->execute()
/var/www/html/apps/files_external/lib/Lib/Storage/SMB.php - line 189:
Icewind\SMB\Wrapped\Share->stat()
/var/www/html/apps/files_external/lib/Lib/Storage/SMB.php - line 342:
OCA\Files_External\Lib\Storage\SMB->getFileInfo()
/var/www/html/lib/private/Files/Storage/Common.php - line 458:
OCA\Files_External\Lib\Storage\SMB->stat()
/var/www/html/apps/files_external/lib/Lib/Storage/SMB.php - line 717:
OC\Files\Storage\Common->test()
/var/www/html/apps/files_external/lib/MountConfig.php - line 130:
OCA\Files_External\Lib\Storage\SMB->test()
/var/www/html/apps/files_external/lib/Controller/StoragesController.php - line 270:
OCA\Files_External\MountConfig::getBackendStatus("*** sensiti ... *")
/var/www/html/apps/files_external/lib/Controller/UserGlobalStoragesController.php - line 123:
OCA\Files_External\Controller\StoragesController->updateStorageStatus("*** sensiti ... *")
/var/www/html/lib/private/AppFramework/Http/Dispatcher.php - line 217:
OCA\Files_External\Controller\UserGlobalStoragesController->show()
/var/www/html/lib/private/AppFramework/Http/Dispatcher.php - line 126:
OC\AppFramework\Http\Dispatcher->executeController()
/var/www/html/lib/private/AppFramework/App.php - line 157:
OC\AppFramework\Http\Dispatcher->dispatch()
/var/www/html/lib/private/Route/Router.php - line 302:
OC\AppFramework\App::main()
/var/www/html/lib/base.php - line 1006:
OC\Route\Router->match()
/var/www/html/index.php - line 36:
OC::handleRequest()