https://groups.google.com/g/accountantally/c/ERIu3fQ7O8I/m/AKz3kdaK...
QuickBooks Error 6123, 0 in Desktop is a common issue that occurs when QuickBooks is unable to access the company file due to various potential causes. The error message typically displays as "We’re Sorry, QuickBooks can’t open the company file." This error can arise during actions such as accessing, restoring, or upgrading company files, particularly over a network.