Backup problem on a client with windows shares

I got a problem with one client.

I can do image of local machine.

I have 2 network shares to backup: 1 is a windows shared folder on another computer, 2 is on a dlink nas, with a smb share.

The client computer have acces to both shares.

When I try to start full backup, I can’t acces the shares with urbackup client:

Erreurs 09/05/19 20:12 Cannot get volume for path “\DLINK-005EAB\Administration”. La syntaxe du nom de fichier, de répertoire ou de volume est incorrecte. (code: 123)
Erreurs 09/05/19 20:12 Creating snapshot of “Administration” failed.
Erreurs 09/05/19 20:12 Cannot access path to backup: “\DLINK-005EAB\Administration” Errorcode: 1326 - Le nom d’utilisateur ou le mot de passe est incorrect.
Erreurs 09/05/19 20:12 Indexing files failed, because of error
Erreurs 09/05/19 20:12 Constructing of filelist of “Soins LHerbier” failed: error - index error
Erreurs 09/05/19 20:12 Backup had an early error. Deleting partial backup.
rreurs 09/05/19 20:05 Error opening volume UNC\serveur-pc\simplecomptable. Accès refusé. (code: 5)
Erreurs 09/05/19 20:05 backupcom->AddToSnapshotSet(&(Server->ConvertToWchar(selected_vols[i])[0]), GUID_NULL, &additional_refs[i].volid) failed. VSS error code VSS_E_VOLUME_NOT_SUPPORTED
Erreurs 09/05/19 20:05 Creating snapshot of “ARCHIVES” failed.
Erreurs 09/05/19 20:05 Cannot access path to backup: “\SERVEUR-PC\simplecomptable\ARCHIVES” Errorcode: 5 - Accès refusé.
Erreurs 09/05/19 20:05 Indexing files failed, because of error
Erreurs 09/05/19 20:05 Constructing of filelist of “Soins LHerbier” failed: error - index error
Erreurs 09/05/19 20:05 Backup had an early error. Deleting partial backup.

I upgraded the server and client to latest version. I look for the VSS services on client, they are started. I can’t see what next to look