@DidierDE this is for the connection, check for the " Failed to create remote folder " log on the sFTP
as this is what is shown on the PBX logs above :
2026-07-10 08:49:48.315|0026|Error| [XAPI.RemoteArchivingSettingsController] Failed to create remote folder sftp://192.168.x.x/sftp/3CX...