To fix QuickBooks multi-user mode not working, first ensure that QuickBooks Database Server Manager is installed and running on the host computer, then open QuickBooks as an Admin user and go to File > Utilities > Host Multi-User Access. Make sure the company file is stored on the server, check that firewall ports and antivirus settings allow QuickBooks communication, and verify that the QuickBooks services (QBDBMgrN) are running. Also, confirm that all users are using the same QuickBooks version and that network connectivity is stable. If the problem continues, call +1 (302) 205-4658 to get expert QuickBooks support for fast resolution of multi-user mode issues.
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