QB Support -> this has nothing to do with it. It's a permissions problem.
Go through this: https://quickbooks.intuit.com/learn-support/en-us/multi-user-mode/set-up-folder-and-windows-access-p...
If you are running terminal server - uninstall qb - and install like this: https://quickbooks.intuit.com/learn-support/en-us/configure-for-multiple-users/install-quickbooks-de...
But also follow permissions settings as first link
