Restart QuickBooks Multi-user Mode Not Working, update QuickBooks to the latest version, check your network connection, ensure all users have proper permissions, and verify that the company file is stored in a shared folder. Also, temporarily disable your firewall or antivirus to rule out blocking issues. link-https://www.deviantart.com/joshua31weissman/journal/Lets-Fix-QuickBooks-Multi-user-Mode-Not-Working-1197572153