Hi there, @aj222.
Let's ensure that you turn on Multi-user Access on your server computer. Here's how:
1. Go to File menu at the top and pick Utilities and Host Multi-User Access on the drop-down.
2. Click Yes on the confirmation window.
For your reference, you can also check out this article for more information about hosting your company data file in multi-user mode.
Then, you can set up your QBDT to a multi-user mode. Make sure that you use to sign in to your server computer has Windows admin rights and the Windows user account for Database Server Manager has admin rights.
Check out this helpful article with detailed steps on how to do it: Set up a multi-user network.
Also, you can browse our self-help articles it provides tips on how to manage your account in QuickBooks.
Please let me know if I can be of additional assistance in the comment section. I'm always here should you have any follow-up questions. Take good care.