I have a few steps that we can try to resolve this, tzykid.

Here are some possible reasons why the company file is missing or cannot be found:

• Computer is disconnected from the path where the QuickBooks file is located.
• QuickBooks file has been deleted from the computer.

Before doing so, please make sure to update your QuickBooks Desktop to the latest release. Then, let's identify the name of your computer server by following these steps:

1. Press the Windows logo + R on your keyboard.
2. Enter CMD then select OK.
3. Enter ipconfig /all then press Enter.
4. Take note of the Host Name (servername).
5. Type ping [name of your server] then press Enter. 

If you see a reply for each packet, this means your computer is connected to your network. If it's a packet loss or a slow reply, I'd recommend consulting your IT professional to diagnose your network.

To view the other solutions, you can check this article: Company file is missing or cannot be found.

If the user is still not able to open the company file in the new location, we can delete their access and add them again.

Here's how:

1. Go to Company located at the top.
2. Select Users.
3. Choose Set Up Users and Roles.
4. Highlight the user, and click Delete.
5. Select Yes to confirm.

Please see sample screenshot below:

Once deleted, add them again. Here's also an article for reference: QuickBooks Desktop Users and Restrictions.

If you're still having the same result after the steps above, you'll want to open manually open the company file on a remote computer.

Let me know how it goes and I'll get back to help you some more. Thanks.