QB Issue Resolution:

The number of users are parallel to the number of computers QB have installed. Since you have 5 users license, then it can installed and used by 5 users at the same time.

Resolution for Issue 'We have a 5 user license for QB Enterprise. Can all 5 users be in the file at once?' available: Yes (Solved).
Source: Intuit Community forum.

We have a 5 user license for QB Enterprise. Can all 5 users be in the file 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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