QuickBooks 2021 Multi-user mode Not Working is a feature inbuilt into QuickBooks and has aided a lot of businesses on working with the application. As the name suggests, multiple users can work on the same company file together without any confusion. How to Solve QuickBooks 2021 Multi User Mode Not Working? Troubleshooting steps for QuickBooks 2021 multi-user mode not working issue. To access the feature, each user must have the QuickBooks License on their workstation. QuickBooks Multi-user mode not working is an issue that arises when the workstations try to launch a company file that is located on the server computer. At times, the error isn’t displayed, but QuickBooks keeps opening in single-user mode. Visit: https://www.repaircontact.com/quickbooks-2021-multi-user-mode-not-working.php