QB Issue Resolution:

Hi darieldap,

If I understand the issue, the error only comes up when you open QuickBooks file on your Mac Computer. However, when QuickBooks file opened on the Windows computer, all is working – right?

Please note in a multi-user environment, hosting should only be enabled on the hosting computer (server).

On each workstation (not the server or hosting computer), open QuickBooks and choose File > Utilities.
If you see Host Multi-User Access on the list, this computer is not hosting the company file and you can go to the next computer. Note: Don’t change anything if you see Host Multi User Access at your workstation.
If you see Stop Hosting Multi-User Access, select that option.
Click Yes to confirm.
In the Company File Must Be Closed window, click Yes.
Repeat steps 1-3 on each computer.

Hope this helps.

Resolution for Issue 'Hello, I have problems trying to open the quickbooks from multiple computers at once' available: Yes (Solved).
Source: Intuit Community forum.

Hello, I have problems trying to open the quickbooks from multiple computers at once: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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